text:
Black people

Black is a racialized classification of people, usually a political and skin color-based category for specific populations with a mid- to dark brown complexion. Not all people considered "black" have dark skin; in certain countries, often in socially based systems of racial classification in the Western world, the term "black" is used to describe persons who are perceived as dark-skinned compared to other populations. It is most commonly used for people of sub-Saharan African ancestry, Indigenous Australians and Melanesians, though it has been applied in many contexts to other groups, and is no indicator of any close ancestral relationship whatsoever. Indigenous African societies do not use the term black as a racial identity outside of influences brought by Western cultures.

Contemporary anthropologists and other scientists, while recognizing the reality of biological variation between different human populations, regard the concept of a unified, distinguishable "Black race" as socially constructed. Different societies apply different criteria regarding who is classified "black", and these social constructs have changed over time. In a number of countries, societal variables affect classification as much as skin color, and the social criteria for "blackness" vary. In the United Kingdom, "black" was historically equivalent with "person of color", a general term for non-European peoples. While the term "person of color" is commonly used and accepted in the United States, the near-sounding term "colored person" is considered highly offensive, except in South Africa, where it is a descriptor for a person of mixed race. In other regions such as Australasia, settlers applied the adjective "black" to the indigenous population. It was universally regarded as highly offensive in Australia until the 1960s and 70s. "Black" was generally not used as a noun, but rather as an adjective qualifying some other descriptor (e.g. "black ****"). As desegregation progressed after the 1967 referendum, some Aboriginals adopted the term, following the American fashion, but it remains problematic. Several American style guides, including the AP Stylebook, changed their guides to capitalize the 'b' in 'black', following the 2020 murder of George Floyd, an African American. The ASA Style Guide says that the 'b' should not be capitalized. Some perceive the term 'black' as a derogatory, outdated, reductive or otherwise unrepresentative label, and as a result neither use nor define it, especially in African countries with little to no history of colonial racial segregation.

Northern Africa
Numerous communities of dark-skinned peoples are present in North Africa, some dating from prehistoric communities. Others descend from migrants via the historical trans-Saharan trade or, after the Arab invasions of North Africa in the 7th century, from slaves from the trans-Saharan slave trade in North Africa. In the 18th century, the Moroccan Sultan Moulay Ismail "the Warrior King" (1672–1727) raised a corps of 150,000 black soldiers, called his Black Guard.

According to Carlos Moore, resident scholar at Brazil's University of the State of Bahia, in the 21st century Afro-multiracials in the Arab world, including Arabs in North Africa, self-identify in ways that resemble multi-racials in Latin America. He claims that darker-toned Arabs, much like darker-toned Latin Americans, consider themselves white because they have some distant white ancestry.

Egyptian President Anwar Sadat had a mother who was a dark-skinned Nubian Sudanese (Sudanese Arab) woman and a father who was a lighter-skinned Egyptian. In response to an advertisement for an acting position, as a young man he said, "I am not white but I am not exactly black either. My blackness is tending to reddish".

Due to the patriarchal nature of Arab society, Arab men, including during the slave trade in North Africa, enslaved more African women than men. The female slaves were often put to work in domestic service and agriculture. The men interpreted the Quran to permit sexual relations between a male master and his enslaved females outside of marriage (see Ma malakat aymanukum and sex), leading to many mixed-race children. When an enslaved woman became pregnant with her Arab master's child, she was considered as umm walad or "mother of a child", a status that granted her privileged rights. The child was given rights of inheritance to the father's property, so mixed-race children could share in any wealth of the father. Because the society was patrilineal, the children inherited their fathers' social status at birth and were born free.

Some mixed-race children succeeded their respective fathers as rulers, such as Sultan Ahmad al-Mansur, who ruled Morocco from 1578 to 1608. He was not technically considered as a mixed-race child of a slave; his mother was Fulani and a concubine of his father.

In early 1991, non-Arabs of the Zaghawa people of Sudan attested that they were victims of an intensifying Arab apartheid campaign, segregating Arabs and non-Arabs (specifically, people of Nilotic ancestry). Sudanese Arabs, who controlled the government, were widely referred to as practicing apartheid against Sudan's non-Arab citizens. The government was accused of "deftly manipulating Arab solidarity" to carry out policies of apartheid and ethnic cleansing.

Sudanese Arabs are also black people in that they are culturally and linguistically Arabized indigenous peoples of Sudan of mostly Nilo-Saharan, Nubian, and Cushitic ancestry; their skin tone and appearance resembles that of other black people.

American University economist George Ayittey accused the Arab government of Sudan of practicing acts of racism against black citizens. According to Ayittey, "In Sudan... the Arabs monopolized power and excluded blacks – Arab apartheid." Many African commentators joined Ayittey in accusing Sudan of practicing Arab apartheid.

Sahara
In the Sahara, the native Tuareg Berber populations kept "negro" slaves. Most of these captives were of Nilo-Saharan extraction, and were either purchased by the Tuareg nobles from slave markets in the Western Sudan or taken during raids. Their origin is denoted via the Ahaggar Berber word Ibenheren (sing. Ébenher), which alludes to slaves that only spoke a Nilo-Saharan language. These slaves were also sometimes known by the borrowed Songhay term Bella.

Similarly, the Sahrawi indigenous peoples of the Western Sahara observed a class system consisting of high castes and low castes. Outside of these traditional tribal boundaries were "Negro" slaves, who were drawn from the surrounding areas.

North-Eastern Africa
In Ethiopia and Somalia, the slave classes mainly consisted of captured peoples from the Sudanese-Ethiopian and Kenyan-Somali international borders or other surrounding areas of Nilotic and Bantu peoples who were collectively known as Shanqella and Adone (both analogues to "negro" in an English-speaking context). Some of these slaves were captured during territorial conflicts in the Horn of Africa and then sold off to slave merchants. The earliest representation of this tradition dates from a seventh or eighth century BC inscription belonging to the Kingdom of Damat.

These captives and others of analogous morphology were distinguished as tsalim barya (dark-skinned slave) in contrast with the Afroasiatic-speaking nobles or saba qayh ("red men") or light-skinned slave; while on the other hand, western racial category standards do not differentiate between saba qayh ("red men"—light-skinned) or saba tiqur ("black men"—dark-skinned) Horn Africans (of either Afroasiatic-speaking, Nilotic-speaking or Bantu origin) thus considering all of them as "black people" (and in some case "negro") according to Western society's notion of race.

Southern Africa
In South Africa, the period of colonization resulted in many unions and marriages between European and Africans (Bantu peoples of South Africa and Khoisans) from various tribes, resulting in mixed-race children. As the European colonialists acquired control of territory, they generally pushed the mixed-race and African populations into second-class status. During the first half of the 20th century, the white-dominated government classified the population according to four main racial groups: Black, White, Asian (mostly Indian), and Coloured. The Coloured group included people of mixed Bantu, Khoisan, and European ancestry (with some Malay ancestry, especially in the Western Cape). The Coloured definition occupied an intermediary political position between the Black and White definitions in South Africa. It imposed a system of legal racial segregation, a complex of laws known as apartheid.

The apartheid bureaucracy devised complex (and often arbitrary) criteria in the Population Registration Act of 1945 to determine who belonged in which group. Minor officials administered tests to enforce the classifications. When it was unclear from a person's physical appearance whether the individual should be considered Coloured or Black, the "pencil test" was used. A pencil was inserted into a person's hair to determine if the hair was kinky enough to hold the pencil, rather than having it pass through, as it would with smoother hair. If so, the person was classified as Black. Such classifications sometimes divided families.

Sandra Laing is a South African woman who was classified as Coloured by authorities during the apartheid era, due to her skin colour and hair texture, although her parents could prove at least three generations of European ancestors. At age 10, she was expelled from her all-white school. The officials' decisions based on her anomalous appearance disrupted her family and adult life. She was the subject of the 2008 biographical dramatic film Skin, which won numerous awards. During the apartheid era, those classed as "Coloured" were oppressed and discriminated against. But, they had limited rights and overall had slightly better socioeconomic conditions than those classed as "Black". The government required that Blacks and Coloureds live in areas separate from Whites, creating large townships located away from the cities as areas for Blacks.

In the post-apartheid era, the Constitution of South Africa has declared the country to be a "Non-racial democracy". In an effort to redress past injustices, the ANC government has introduced laws in support of affirmative action policies for Blacks; under these they define "Black" people to include "Africans", "Coloureds" and "Asians". Some affirmative action policies favor "Africans" over "Coloureds" in terms of qualifying for certain benefits. Some South Africans categorized as "African Black" say that "Coloureds" did not suffer as much as they did during apartheid. "Coloured" South Africans are known to discuss their dilemma by saying, "we were not white enough under apartheid, and we are not black enough under the ANC (African National Congress)".

In 2008, the High Court in South Africa ruled that Chinese South Africans who were residents during the apartheid era (and their descendants) are to be reclassified as "Black people," solely for the purposes of accessing affirmative action benefits, because they were also "disadvantaged" by racial discrimination. Chinese people who arrived in the country after the end of apartheid do not qualify for such benefits.

Other than by appearance, "Coloureds" can usually be distinguished from "Blacks" by language. Most speak Afrikaans or English as a first language, as opposed to Bantu languages such as Zulu or Xhosa. They also tend to have more European-sounding names than Bantu names.

Afro-Asians
"Afro-Asians" or "African-Asians" are persons of mixed sub-Saharan African and Asian ancestry. In the United States, they are also called "black Asians" or "Blasians". Historically, Afro-Asian populations have been marginalized as a result of human migration and social conflict.

Arab world
In the medieval Arab world, the ethnic designation of "Black" encompassed not only Zanj, or Africans, but also communities like Zutt, Sindis and Indians from the Indian subcontinent. Historians estimate that between the advent of Islam in 650 CE and the abolition of slavery in the Arabian Peninsula in the mid-20th century, 10 to 18 million black Africans (known as the Zanj) were enslaved by east African slave traders and transported to the Arabian Peninsula and neighboring countries. This number far exceeded the number of slaves who were taken to the Americas. Slavery in Saudi Arabia and slavery in Yemen was abolished in 1962, slavery in Dubai in 1963, and slavery in Oman in 1970.

Several factors affected the visibility of descendants of this diaspora in 21st-century Arab societies: The traders shipped more female slaves than males, as there was a demand for them to serve as concubines in harems in the Arabian Peninsula and neighboring countries. Male slaves were castrated in order to serve as harem guards. The death toll of black African slaves from forced labor was high. The mixed-race children of female slaves and Arab owners were assimilated into the Arab owners' families under the patrilineal kinship system. As a result, few distinctive Afro-Arab communities have survived in the Arabian Peninsula and neighboring countries.

Distinctive and self-identified black communities have been reported in countries such as Iraq, with a reported 1.2 million black people (Afro-Iraqis), and they attest to a history of discrimination. These descendants of the Zanj have sought minority status from the government, which would reserve some seats in Parliament for representatives of their population. According to Alamin M. Mazrui et al., generally in the Arabian Peninsula and neighboring countries, most of these communities identify as both black and Arab.

Iran
Afro-Iranians are people of black African ancestry residing in Iran. During the Qajar dynasty, many wealthy households imported black African women and children as slaves to perform domestic work. This slave labor was drawn exclusively from the Zanj, who were Bantu-speaking peoples that lived along the African Great Lakes, in an area roughly comprising modern-day Tanzania, Mozambique and Malawi.

Israel
About 150,000 East African and black people live in Israel, amounting to just over 2% of the nation's population. The vast majority of these, some 120,000, are Beta Israel, most of whom are recent immigrants who came during the 1980s and 1990s from Ethiopia. In addition, Israel is home to more than 5,000 members of the African Hebrew Israelites of Jerusalem movement that are ancestry of African Americans who emigrated to Israel in the 20th century, and who reside mainly in a distinct neighborhood in the Negev town of Dimona. Unknown numbers of black converts to Judaism reside in Israel, most of them converts from the United Kingdom, Canada, and the United States.

Additionally, there are around 60,000 non-Jewish African immigrants in Israel, some of whom have sought asylum. Most of the migrants are from communities in Sudan and Eritrea, particularly the Niger-Congo-speaking Nuba groups of the southern Nuba Mountains; some are illegal immigrants.

Turkey
Beginning several centuries ago, during the period of the Ottoman Empire, tens of thousands of Zanj captives were brought by slave traders to plantations and agricultural areas situated between Antalya and Istanbul, which gave rise to the Afro-Turk population in present-day Turkey. Some of their ancestry remained in situ, and many migrated to larger cities and towns. Other black slaves were transported to Crete, from where they or their descendants later reached the İzmir area through the population exchange between Greece and Turkey in 1923, or indirectly from Ayvalık in pursuit of work.

Apart from the historical Afro-Turk presence Turkey also hosts a sizeable immigrant black population since the end of the 1990s. The community is composed mostly of modern immigrants from Ghana, Ethiopia, DRC, Sudan, Nigeria, Kenya, Eritrea, Somalia and Senegal. According to official figures 1.5 million Africans live in Turkey and around 25% of them are located in Istanbul. Other studies state the majority of Africans in Turkey lives in Istanbul and report Tarlabaşı, Dolapdere, Kumkapı, Yenikapı and Kurtuluş as having a strong African presence.

Most of the African immigrants in Turkey come to Turkey to further migrate to Europe. Immigrants from Eastern Africa are usually refugees, meanwhile Western and Central African immigration is reported to be economically driven. It is reported that African immigrants in Turkey regularly face economic and social challenges, notably racism and opposition to immigration by locals.

Southern Asia
The Siddi are an ethnic group inhabiting India and Pakistan. Members are descended from the Bantu peoples of Southeast Africa. Some were merchants, sailors, indentured servants, slaves or mercenaries. The Siddi population is currently estimated at 270,000–350,000 individuals, living mostly in Karnataka, Gujarat, and Hyderabad in India and Makran and Karachi in Pakistan. In the Makran strip of the Sindh and Balochistan provinces in southwestern Pakistan, these Bantu descendants are known as the Makrani. There was a brief "Black Power" movement in Sindh in the 1960s and many Siddi are proud of and celebrate their African ancestry.

Southeastern Asia
Negritos, are a collection of various, often unrelated peoples, who were once considered a single distinct population of closely related groups, but genetic studies showed that they descended from the same ancient East Eurasian meta-population which gave rise to modern East Asian peoples, and consist of several separate groups, as well as displaying genetic heterogeneity. They inhabit isolated parts of Southeast Asia, and are now confined primarily to Southern Thailand, the Malay Peninsula, and the Andaman Islands of India.

Negrito means "little black people" in Spanish (negrito is the Spanish diminutive of negro, i.e., "little black person"); it is what the Spaniards called the aborigines that they encountered in the Philippines. The term Negrito itself has come under criticism in countries like Malaysia, where it is now interchangeable with the more acceptable Semang, although this term actually refers to a specific group.

They have dark skin, often curly-hair and Asiatic facial characteristics, and are stockily built.

Negritos in the Philippines frequently face discrimination. Because of their traditional hunter-gatherer lifestyle, they are marginalized and live in poverty, unable to find employment.

France
While census collection of ethnic background is illegal in France, it is estimated that there are about 2.5 – 5 million black people residing there.

Germany
As of 2020, there are approximately one million black people living in Germany.

Netherlands
Afro-Dutch are residents of the Netherlands who are of Black African or Afro-Caribbean ancestry. They tend to be from the former and present Dutch overseas territories of Aruba, Bonaire, Curaçao, Sint Maarten and Suriname. The Netherlands also has sizable Cape Verdean and other African communities.

Portugal
As of 2021, there were at least 232,000 people of recent Black-African immigrant background living in Portugal. They mainly live in the regions of Lisbon, Porto, Coimbra. As Portugal doesn't collect information dealing with ethnicity, the estimate includes only people that, as of 2021, hold the citizenship of a Sub Saharan African country or people who have acquired Portuguese citizenship from 2008 to 2021, thus excluding descendants, people of more distant African ancestry or people who have settled in Portugal generations ago and are now Portuguese citizens.

Spain
The term "Moors" has been used in Europe in a broader, somewhat derogatory sense to refer to Muslims, especially those of Arab or Berber ancestry, whether living in North Africa or Iberia. Moors were not a distinct or self-defined people. Medieval and early modern Europeans applied the name to Muslim Arabs, Berbers, Sub-Saharan Africans and Europeans alike.

Isidore of Seville, writing in the 7th century, claimed that the Latin word Maurus was derived from the Greek mauron, μαύρον, which is the Greek word for "black". Indeed, by the time Isidore of Seville came to write his Etymologies, the word Maurus or "Moor" had become an adjective in Latin, "for the Greeks call black, mauron". "In Isidore's day, Moors were black by definition..."

Afro-Spaniards are Spanish nationals of West/Central African ancestry. Today, they mainly come from Cameroon, Equatorial Guinea, Ghana, Gambia, Mali, Nigeria and Senegal. Additionally, many Afro-Spaniards born in Spain are from the former Spanish colony Equatorial Guinea. Today, there are an estimated 683,000 Afro-Spaniards in Spain.

United Kingdom
According to the Office for National Statistics, at the 2001 census there were more than a million black people in the United Kingdom; 1% of the total population described themselves as "Black Caribbean", 0.8% as "Black African", and 0.2% as "Black other". Britain encouraged the immigration of workers from the Caribbean after World War II; the first symbolic movement was of those who came on the ship the Empire Windrush and, hence, those who migrated between 1948 and 1970 are known as the Windrush generation. The preferred official umbrella term is "black, Asian and minority ethnic" (BAME), but sometimes the term "black" is used on its own, to express unified opposition to racism, as in the Southall Black Sisters, which started with a mainly British Asian constituency, and the National Black Police Association, which has a membership of "African, African-Caribbean and Asian origin".

Eastern Europe
As African states became independent in the 1960s, the Soviet Union offered many of their citizens the chance to study in Russia. Over a period of 40 years, about 400,000 African students from various countries moved to Russia to pursue higher studies, including many black Africans. This extended beyond the Soviet Union to many countries of the Eastern bloc.

Balkans
Due to the slave trade in the Ottoman Empire that had flourished in the Balkans, the coastal town of Ulcinj in Montenegro had its own black community. In 1878, that community consisted of about 100 people.

Indigenous Australians
Indigenous Australians have been referred to as "black people" in Australia since the early days of European settlement. While originally related to skin colour, the term is used today to indicate Aboriginal or Torres Strait Islander ancestry in general and can refer to people of any skin pigmentation.

Being identified as either "black" or "white" in Australia during the 19th and early 20th centuries was critical in one's employment and social prospects. Various state-based Aboriginal Protection Boards were established which had virtually complete control over the lives of Indigenous Australians – where they lived, their employment, marriage, education and included the power to separate children from their parents. Aborigines were not allowed to vote and were often confined to reserves and forced into low paid or effectively slave labour. The social position of mixed-race or "half-caste" individuals varied over time. A 1913 report by Baldwin Spencer states that:

"the half-castes belong neither to the aboriginal nor to the whites, yet, on the whole, they have more leaning towards the former; ... One thing is certain and that is that the white population as a whole will never mix with half-castes... the best and kindest thing is to place them on reserves along with the natives, train them in the same schools and encourage them to marry amongst themselves."

After the First World War, however, it became apparent that the number of mixed-race people was growing at a faster rate than the white population, and, by 1930, fear of the "half-caste menace" undermining the White Australia ideal from within was being taken as a serious concern. Cecil Cook, the Northern Territory Protector of Natives, noted that:

"generally by the fifth and invariably by the sixth generation, all native characteristics of the Australian Aborigine are eradicated. The problem of our half-castes will quickly be eliminated by the complete disappearance of the black race, and the swift submergence of their progeny in the white."

The official policy became one of biological and cultural assimilation: "Eliminate the full-blood and permit the white admixture to half-castes and eventually the race will become white". This led to different treatment for "black" and "half-caste" individuals, with lighter-skinned individuals targeted for removal from their families to be raised as "white" people and prohibited from speaking their native language and practicing traditional customs, a process now known as the Stolen Generation.

The second half of the 20th century to the present has seen a gradual shift towards improved human rights for Aboriginal people. In a 1967 referendum, more than 90% of the Australian population voted to end constitutional discrimination and to include Aborigines in the national census. During this period, many Aboriginal activists began to embrace the term "black" and use their ancestry as a source of pride. Activist Bob Maza said: "I only hope that when I die I can say I'm black and it's beautiful to be black. It is this sense of pride which we are trying to give back to the aborigine [sic] today."

In 1978, Aboriginal writer Kevin Gilbert received the National Book Council award for his book Living Black: Blacks Talk to Kevin Gilbert, a collection of Aboriginal people's stories, and in 1998 was awarded (but refused to accept) the Human Rights Award for Literature for Inside Black Australia, a poetry anthology and exhibition of Aboriginal photography. In contrast to previous definitions based solely on the degree of Aboriginal ancestry, the Government changed the legal definition of Aboriginal in 1990 to include any: "person of Aboriginal or Torres Strait Islander descent who identifies as an Aboriginal or Torres Strait Islander and is accepted as such by the community in which he [or she] lives"

This nationwide acceptance and recognition of Aboriginal people led to a significant increase in the number of people self-identifying as Aboriginal or Torres Strait Islander. The reappropriation of the term "black" with a positive and more inclusive meaning has resulted in its widespread use in mainstream Australian culture, including public media outlets, government agencies, and private companies. In 2012, a number of high-profile cases highlighted the legal and community attitude that identifying as Aboriginal or Torres Strait Islander is not dependent on skin color, with a well-known boxer Anthony Mundine being widely criticized for questioning the "blackness" of another boxer and journalist Andrew Bolt being successfully sued for publishing discriminatory comments about Aboriginals with light skin.

Melanesians
The region of Melanesia is named from Greek μέλας, black, and νῆσος, island, etymologically meaning "islands of black [people]", in reference to the dark skin of the indigenous peoples. Early European settlers, such as Spanish explorer Yñigo Ortiz de Retez, noted the resemblance of the people to those in Africa.

Melanesians, along with other Pacific Islanders, were frequently deceived or coerced during the 19th and 20th centuries into forced labour for sugarcane, cotton, and coffee planters in countries distant to their native lands in a practice known as blackbirding. In Queensland, some 55,000 to 62,500 were brought from the New Hebrides, the Solomon Islands, and New Guinea to work in sugarcane fields. Under the Pacific Island Labourers Act 1901, most islanders working in Queensland were repatriated back to their homelands. Those who remained in Australia, commonly called South Sea Islanders, often faced discrimination similarly to Indigenous Australians by white-dominated society. Many indigenous rights activists have South Sea Islander ancestry, including Faith Bandler, Evelyn Scott and Bonita Mabo.

Many Melanesians have taken up the term 'Melanesia' as a way to empower themselves as a collective people. Stephanie Lawson writes that the term "moved from a term of denigration to one of affirmation, providing a positive basis for contemporary subregional identity as well as a formal organisation". For instance, the term is used in the Melanesian Spearhead Group, which seeks to promote economic growth among Melanesian countries.

Other
John Caesar, nicknamed "Black Caesar", a convict and bushranger with parents born in an unknown area in Africa, was one of the first people of recent black African ancestry to arrive in Australia.

At the 2006 Census, 248,605 residents declared that they were born in Africa. This figure pertains to all immigrants to Australia who were born in nations in Africa regardless of race, and includes white Africans.

Canada
"Black Canadians" is a designation used for people of black African ancestry who are citizens or permanent residents of Canada. The majority of black Canadians are of Caribbean origin, though the population also consists of African American immigrants and their descendants (including black Nova Scotians), as well as many African immigrants.

Black Canadians often draw a distinction between those of Afro-Caribbean ancestry and those of other African roots. The term African Canadian is occasionally used by some black Canadians who trace their heritage to the first slaves brought by British and French colonists to the North American mainland. Promised freedom by the British during the American Revolutionary War, thousands of Black Loyalists were resettled by the Crown in Canada afterward, such as Thomas Peters. In addition, an estimated ten to thirty thousand fugitive slaves reached freedom in Canada from the Southern United States during the Antebellum years, aided by people along the Underground Railroad.

Many black people of Caribbean origin in Canada reject the term "African Canadian" as an elision of the uniquely Caribbean aspects of their heritage, and instead identify as Caribbean Canadian. Unlike in the United States, where "African American" has become a widely used term, in Canada controversies associated with distinguishing African or Caribbean heritage have resulted in the term "black Canadian" being widely accepted there.

United States

There were eight principal areas used by Europeans to buy and ship slaves to the Western Hemisphere. The number of enslaved people sold to the New World varied throughout the slave trade. As for the distribution of slaves from regions of activity, certain areas produced far more enslaved people than others. Between 1650 and 1900, 10.24 million enslaved West Africans arrived in the Americas from the following regions in the following proportions:

 * Senegambia (Senegal and The Gambia): 4.8%
 * Upper Guinea (Guinea-Bissau, Guinea and Sierra Leone): 4.1%
 * Windward Coast (Liberia and Ivory Coast): 1.8%
 * Gold Coast (Ghana and east of Ivory Coast): 10.4%
 * Bight of Benin (Togo, Benin and Nigeria west of the Niger Delta): 20.2%
 * Bight of Biafra (Nigeria east of the Niger Delta, Cameroon, Equatorial Guinea and Gabon): 14.6%
 * West Central Africa (Republic of the Congo, Democratic Republic of the Congo and Angola): 39.4%
 * Southeastern Africa (Mozambique and Madagascar): 4.7%

By the early 1900s, nigger had become a pejorative word in the United States. In its stead, the term colored became the mainstream alternative to negro and its derived terms. After the American Civil Rights Movement, the terms colored and negro gave way to "black". Negro had superseded colored as the most polite word for African Americans at a time when black was considered more offensive. This term was accepted as normal, including by people classified as Negroes, until the later Civil Rights movement in the late 1960s. One well-known example is the use by Dr. Rev. Martin Luther King Jr. of "Negro" in his famous speech of 1963, I Have a Dream. During the American civil rights movement of the 1950s and 1960s, some African-American leaders in the United States, notably Malcolm X, objected to the word Negro because they associated it with the long history of slavery, segregation, and discrimination that treated African Americans as second-class citizens, or worse. Malcolm X preferred Black to Negro, but later gradually abandoned that as well for Afro-American after leaving the Nation of Islam.

Since the late 1960s, various other terms for African Americans have been more widespread in popular usage. Aside from black American, these include Afro-American (in use from the late 1960s to 1990) and African American (used in the United States to refer to Black Americans, people often referred to in the past as American Negroes).

In the first 200 years that black people were in the United States, they primarily identified themselves by their specific ethnic group (closely allied to language) and not by skin color. Individuals identified themselves, for example, as Ashanti, Igbo, Bakongo, or Wolof. However, when the first captives were brought to the Americas, they were often combined with other groups from West Africa, and individual ethnic affiliations were not generally acknowledged by English colonists. In areas of the Upper South, different ethnic groups were brought together. This is significant as the captives came from a vast geographic region: the West African coastline stretching from Senegal to Angola and in some cases from the south-east coast such as Mozambique. A new African-American identity and culture was born that incorporated elements of the various ethnic groups and of European cultural heritage, resulting in fusions such as the Black church and African-American English. This new identity was based on provenance and slave status rather than membership in any one ethnic group.

By contrast, slave records from Louisiana show that the French and Spanish colonists recorded more complete identities of the West Africans, including ethnicities and given tribal names.

The U.S. racial or ethnic classification "black" refers to people with all possible kinds of skin pigmentation, from the darkest through to the very lightest skin colors, including albinos, if they are believed by others to have African ancestry (in any discernible percentage). There are also certain cultural traits associated with being "African American", a term used effectively as a synonym for "black person" within the United States.

In March 1807, Great Britain, which largely controlled the Atlantic, declared the transatlantic slave trade illegal, as did the United States. (The latter prohibition took effect 1 January 1808, the earliest date on which Congress had the power to do so after protecting the slave trade under Article I, Section 9 of the United States Constitution.)

By that time, the majority of black people in the United States were native-born, so the use of the term "African" became problematic. Though initially a source of pride, many blacks feared that the use of African as an identity would be a hindrance to their fight for full citizenship in the United States. They also felt that it would give ammunition to those who were advocating repatriating black people back to Africa. In 1835, black leaders called upon Black Americans to remove the title of "African" from their institutions and replace it with "Negro" or "Colored American". A few institutions chose to keep their historic names, such as the African Methodist Episcopal Church. African Americans popularly used the terms "Negro" or "colored" for themselves until the late 1960s.

The term black was used throughout but not frequently since it carried a certain stigma. In his 1963 "I Have a Dream" speech, Martin Luther King Jr. uses the terms negro fifteen times and black four times. Each time that he uses black, it is in parallel construction with white; for example, "black men and white men".

With the successes of the American Civil Rights Movement, a new term was needed to break from the past and help shed the reminders of legalized discrimination. In place of Negro, activists promoted the use of black as standing for racial pride, militancy, and power. Some of the turning points included the use of the term "Black Power" by Kwame Ture (Stokely Carmichael) and the popular singer James Brown's song "Say It Loud – I'm Black and I'm Proud".

In 1988, the civil rights leader Jesse Jackson urged Americans to use instead the term "African American" because it had a historical cultural base and was a construction similar to terms used by European descendants, such as German American, Italian American, etc. Since then, African American and black have often had parallel status. However, controversy continues over which, if any, of the two terms is more appropriate. Maulana Karenga argues that the term African-American is more appropriate because it accurately articulates their geographical and historical origin. Others have argued that "black" is a better term because "African" suggests foreignness, although black Americans helped found the United States. Still others believe that the term "black" is inaccurate because African Americans have a variety of skin tones. Some surveys suggest that the majority of Black Americans have no preference for "African American" or "black", although they have a slight preference for "black" in personal settings and "African American" in more formal settings.

In the U.S. census race definitions, black and African Americans are citizens and residents of the United States with origins in the black racial groups of Africa. According to the Office of Management and Budget, the grouping includes individuals who self-identify as African American, as well as persons who emigrated from nations in the Caribbean and sub-Saharan Africa. The grouping is thus based on geography, and may contradict or misrepresent an individual's self-identification, since not all immigrants from sub-Saharan Africa are "black". The Census Bureau also notes that these classifications are socio-political constructs and should not be interpreted as scientific or anthropological.

According to U.S. Census Bureau data, African immigrants generally do not self-identify as African American. The overwhelming majority of African immigrants identify instead with their own respective ethnicities (~95%). Immigrants from some Caribbean, Central American and South American nations and their descendants may or may not also self-identify with the term.

Recent surveys of African Americans using a genetic testing service have found varied ancestries that show different tendencies by region and sex of ancestors. These studies found that on average, African Americans have 73.2–80.9% West African, 18–24% European, and 0.8–0.9% Native American genetic heritage, with large variation between individuals.

According to studies in the Journal of Personality and Social Psychology, U.S. residents consistently overestimate the size, physical strength, and formidability of young black men.

One-drop rule
From the late 19th century, the South used a colloquial term, the one-drop rule, to classify as black a person of any known African ancestry. This practice of hypodescent was not put into law until the early 20th century. Legally, the definition varied from state to state. Racial definition was more flexible in the 18th and 19th centuries before the American Civil War. For instance, President Thomas Jefferson held in slavery persons who were legally white (less than 25% black) according to Virginia law at the time, but, because they were born to slave mothers, they were born into slavery, according to the principle of partus sequitur ventrem, which Virginia adopted into law in 1662.

Outside of the United States, some other countries have adopted the one-drop rule, but the definition of who is black and the extent to which the one-drop "rule" applies varies greatly from country to country.

The one-drop rule may have originated as a means of increasing the number of black slaves and was maintained as an attempt to keep the white race "pure". One of the results of the one-drop rule was the uniting of the African-American community. Some of the most prominent abolitionists and civil-rights activists of the 19th century were multiracial, such as Frederick Douglass, Robert Purvis and James Mercer Langston. They advocated equality for all.

Blackness

The concept of blackness in the United States has been described as the degree to which one associates themselves with mainstream African-American culture, politics, and values. To a certain extent, this concept is not so much about race but more about political orientation, culture and behavior. Blackness can be contrasted with "acting white", where black Americans are said to behave with assumed characteristics of stereotypical white Americans with regard to fashion, dialect, taste in music, and possibly, from the perspective of a significant number of black youth, academic achievement.

Due to the often political and cultural contours of blackness in the United States, the notion of blackness can also be extended to non-black people. Toni Morrison once described Bill Clinton as the first black President of the United States, because, as she put it, he displayed "almost every trope of blackness". Clinton welcomed the label.

The question of blackness also arose in the Democrat Barack Obama's 2008 presidential campaign. Commentators questioned whether Obama, who was elected the first president with black ancestry, was "black enough", contending that his background is not typical because his mother was a white American and his father was a black student visitor from Kenya. Obama chose to identify as black and African American.

Mexico
The 2015 preliminary survey to the 2020 census allowed Afro-Mexicans to self-identify for the first time in Mexico and recorded a total of 1.4 million (1.2% of the total Mexican population). The majority of Afro-Mexicans live in the Costa Chica of Guerrero region.

Dominican Republic
The first Afro-Dominican slaves were shipped to the Dominican Republic by Spanish conquistadors during the Transatlantic slave trade.

Puerto Rico
Spanish conquistadors shipped slaves from West Africa to Puerto Rico. Afro-Puerto Ricans in part trace ancestry to this colonization of the island.

South America
Approximately 12 million people were shipped from Africa to the Americas during the Atlantic slave trade from 1492 to 1888. Of these, 11.5 million of those shipped to South America and the Caribbean. Brazil was the largest importer in the Americas, with 5.5 million African slaves imported, followed by the British Caribbean with 2.76 million, the Spanish Caribbean and Spanish Mainland with 1.59 million Africans, and the French Caribbean with 1.32 million. Today their descendants number approximately 150 million in South America and the Caribbean. In addition to skin color, other physical characteristics such as facial features and hair texture are often variously used in classifying peoples as black in South America and the Caribbean. In South America and the Caribbean, classification as black is also closely tied to social status and socioeconomic variables, especially in light of social conceptions of "blanqueamiento" (racial whitening) and related concepts.

Brazil
The concept of race in Brazil is complex. A Brazilian child was never automatically identified with the racial type of one or both of their parents, nor were there only two categories to choose from. Between an individual of unmixed West African ancestry and a very light mulatto individual, more than a dozen racial categories were acknowledged, based on various combinations of hair color, hair texture, eye color, and skin color. These types grade into each other like the colors of the spectrum, and no one category stands significantly isolated from the rest. In Brazil, people are classified by appearance, not heredity.

Scholars disagree over the effects of social status on racial classifications in Brazil. It is generally believed that achieving upward mobility and education results in individuals being classified as a category of lighter skin. The popular claim is that in Brazil, poor whites are considered black and wealthy blacks are considered white. Some scholars disagree, arguing that "whitening" of one's social status may be open to people of mixed race, a large part of the population known as pardo, but a person perceived as preto (black) will continue to be classified as black regardless of wealth or social status.

Statistics
From the years 1500 to 1850, an estimated 3.5 million captives were forcibly shipped from West/Central Africa to Brazil. The territory received the highest number of slaves of any country in the Americas. Scholars estimate that more than half of the Brazilian population is at least in part descended from these individuals. Brazil has the largest population of Afro-ancestry outside Africa. In contrast to the US, during the slavery period and after, the Portuguese colonial government in Brazil and the later Brazilian government did not pass formal anti-miscegenation or segregation laws. As in other Latin American countries, intermarriage was prevalent during the colonial period and continued afterward. In addition, people of mixed race (pardo) often tended to marry white spouses, and their descendants became accepted as white. As a result, some of the European descended population also has West African or Amerindian blood. According to the last census of the 20th century, in which Brazilians could choose from five color/ethnic categories with which they identified, 54% of individuals identified as white, 6.2% identified as black, and 39.5% identified as pardo (brown)—a broad multi-racial category, including tri-racial persons.

In the 19th century, a philosophy of racial whitening emerged in Brazil, related to the assimilation of mixed-race people into the white population through intermarriage. Until recently the government did not keep data on race. However, statisticians estimate that in 1835, roughly 50% of the population was preto (black; most were enslaved), a further 20% was pardo (brown), and 25% white, with the remainder Amerindian. Some classified as pardo were tri-racial.

By the 2000 census, demographic changes including the end to slavery, immigration from Europe and Asia, assimilation of multiracial persons, and other factors resulted in a population in which 6.2% of the population identified as black, 40% as pardo, and 55% as white. Essentially most of the black population was absorbed into the multi-racial category by intermixing. A 2007 genetic study found that at least 29% of the middle-class, white Brazilian population had some recent (since 1822 and the end of the colonial period) African ancestry.

Race relations in Brazil
According to the 2022 census, 10.2% of Brazilians said they were black, compared with 7.6% in 2010, and 45.3% said they were racially mixed, up from 43.1%, while the proportion of self-declared white Brazilians has fallen from 47.7% to 43.5%. Activists from Brazil’s Black movement attribute the racial shift in the population to a growing sense of pride among African-descended Brazilians in recognising and celebrating their ancestry.

The philosophy of the racial democracy in Brazil has drawn some criticism, based on economic issues. Brazil has one of the largest gaps in income distribution in the world. The richest 10% of the population earn 28 times the average income of the bottom 40%. The richest 10 percent is almost exclusively white or predominantly European in ancestry. One-third of the population lives under the poverty line, with blacks and other people of color accounting for 70 percent of the poor. In 2015 United States, African Americans, including multiracial people, earned 76.8% as much as white people. By contrast, black and mixed race Brazilians earned on average 58% as much as whites in 2014. The gap in income between blacks and other non-whites is relatively small compared to the large gap between whites and all people of color. Other social factors, such as illiteracy and education levels, show the same patterns of disadvantage for people of color.

Some commentators observe that the United States practice of segregation and white supremacy in the South, and discrimination in many areas outside that region, forced many African Americans to unite in the civil rights struggle, whereas the fluid nature of race in Brazil has divided individuals of African ancestry between those with more or less ancestry and helped sustain an image of the country as an example of post-colonial harmony. This has hindered the development of a common identity among black Brazilians.

Though Brazilians of at least partial African heritage make up a large percentage of the population, few blacks have been elected as politicians. The city of Salvador, Bahia, for instance, is 80% people of color, but voters have not elected a mayor of color.

Patterns of discrimination against non-whites have led some academic and other activists to advocate for use of the Portuguese term negro to encompass all African-descended people, in order to stimulate a "black" consciousness and identity.

Colombia
Afro-Colombians are the third-largest African diaspora population in Latin America after Afro-Brazilians and Afro-Haitians.

Venezuela
Most black Venezuelans descend from people brought as slaves to Venezuela directly from Africa during colonization; others have been descendants of immigrants from the Antilles and Colombia. Many blacks were part of the independence movement, and several managed to be heroes. There is a deep-rooted heritage of African culture in Venezuelan culture, as demonstrated in many traditional Venezuelan music and dances, such as the Tambor, a musical genre inherited from black members of the colony, or the Llanera music or the Gaita zuliana that both are a fusion of all the three major peoples that contribute to the cultural heritage. Also, black inheritance is present in the country's gastronomy.

There are entire communities of blacks in the Barlovento zone, as well as part of the Bolívar state and in other small towns; they also live peaceably among the general population in the rest of Venezuela. Currently, blacks represent a plurality of the Venezuelan population, although many are actually mixed people.

title: Black people


text:
Plague (disease)

Plague is an infectious disease caused by the bacterium Yersinia pestis. Symptoms include fever, weakness and headache. Usually this begins one to seven days after exposure. There are three forms of plague, each affecting a different part of the body and causing associated symptoms. Pneumonic plague infects the lungs, causing shortness of breath, coughing and chest pain; bubonic plague affects the lymph nodes, making them swell; and septicemic plague infects the blood and can cause tissues to turn black and die.

The bubonic and septicemic forms are generally spread by flea bites or handling an infected animal, whereas pneumonic plague is generally spread between people through the air via infectious droplets. Diagnosis is typically by finding the bacterium in fluid from a lymph node, blood or sputum.

Those at high risk may be vaccinated. Those exposed to a case of pneumonic plague may be treated with preventive medication. If infected, treatment is with antibiotics and supportive care. Typically antibiotics include a combination of gentamicin and a fluoroquinolone. The risk of death with treatment is about 10% while without it is about 70%.

Globally, about 600 cases are reported a year. In 2017, the countries with the most cases include the Democratic Republic of the Congo, Madagascar and Peru. In the United States, infections occasionally occur in rural areas, where the bacteria are believed to circulate among rodents. It has historically occurred in large outbreaks, with the best known being the Black Death in the 14th century, which resulted in more than 50 million deaths in Europe.

Signs and symptoms
There are several different clinical manifestations of plague. The most common form is bubonic plague, followed by septicemic and pneumonic plague. Other clinical manifestations include plague meningitis, plague pharyngitis, and ocular plague. General symptoms of plague include fever, chills, headaches, and nausea. Many people experience swelling in their lymph nodes if they have bubonic plague. For those with pneumonic plague, symptoms may (or may not) include a cough, pain in the chest, and haemoptysis.

Bubonic plague

When a flea bites a human and contaminates the wound with regurgitated blood, the plague-causing bacteria are passed into the tissue. Y. pestis can reproduce inside cells, so even if phagocytosed, they can still survive. Once in the body, the bacteria can enter the lymphatic system, which drains interstitial fluid. Plague bacteria secrete several toxins, one of which is known to cause beta-adrenergic blockade.

Y. pestis spreads through the lymphatic vessels of the infected human until it reaches a lymph node, where it causes acute lymphadenitis. The swollen lymph nodes form the characteristic buboes associated with the disease, and autopsies of these buboes have revealed them to be mostly hemorrhagic or necrotic.

If the lymph node is overwhelmed, the infection can pass into the bloodstream, causing secondary septicemic plague and if the lungs are seeded, it can cause secondary pneumonic plague.

Septicemic plague
Lymphatics ultimately drain into the bloodstream, so the plague bacteria may enter the blood and travel to almost any part of the body. In septicemic plague, bacterial endotoxins cause disseminated intravascular coagulation (DIC), causing tiny clots throughout the body and possibly ischemic necrosis (tissue death due to lack of circulation/perfusion to that tissue) from the clots. DIC results in depletion of the body's clotting resources so that it can no longer control bleeding. Consequently, there is bleeding into the skin and other organs, which can cause red and/or black patchy rash and hemoptysis/hematemesis (coughing up/ vomiting of blood). There are bumps on the skin that look somewhat like insect bites; these are usually red, and sometimes white in the centre. Untreated, the septicemic plague is usually fatal. Early treatment with antibiotics reduces the mortality rate to between 4 and 15 per cent.

Pneumonic plague
The pneumonic form of plague arises from infection of the lungs. It causes coughing and thereby produces airborne droplets that contain bacterial cells and are likely to infect anyone inhaling them. The incubation period for pneumonic plague is short, usually two to four days, but sometimes just a few hours. The initial signs are indistinguishable from several other respiratory illnesses; they include headache, weakness, and spitting or vomiting of blood. The course of the disease is rapid; unless diagnosed and treated soon enough, typically within a few hours, death may follow in one to six days; in untreated cases, mortality is nearly 100%.

Cause
Transmission of Y. pestis to an uninfected individual is possible by any of the following means: Yersinia pestis circulates in animal reservoirs, particularly in rodents, in the natural foci of infection found on all continents except Australia. The natural foci of plague are situated in a broad belt in the tropical and sub-tropical latitudes and the warmer parts of the temperate latitudes around the globe, between the parallels 55° N and 40° S. Contrary to popular belief, rats did not directly start the spread of the bubonic plague. It is mainly a disease in the fleas (Xenopsylla cheopis) that infested the rats, making the rats themselves the first victims of the plague. Rodent-borne infection in a human occurs when a person is bitten by a flea that has been infected by biting a rodent that itself has been infected by the bite of a flea carrying the disease. The bacteria multiply inside the flea, sticking together to form a plug that blocks its stomach and causes it to starve. The flea then bites a host and continues to feed, even though it cannot quell its hunger, and consequently, the flea vomits blood tainted with the bacteria back into the bite wound. The bubonic plague bacterium then infects a new person and the flea eventually dies from starvation. Serious outbreaks of plague are usually started by other disease outbreaks in rodents or a rise in the rodent population.
 * droplet contact – coughing or sneezing on another person
 * Direct physical contact;– touching an infected person, including sexual contact
 * indirect contact – usually by touching soil contamination or a contaminated surface
 * airborne transmission – if the microorganism can remain in the air for long periods
 * fecal-oral transmission – usually from contaminated food or water sources
 * vector borne transmission – carried by insects or other animals.

A 21st-century study of a 1665 outbreak of plague in the village of Eyam in England's Derbyshire Dales – which isolated itself during the outbreak, facilitating modern study – found that three-quarters of cases are likely to have been due to human-to-human transmission, especially within families, a much bigger proportion than previously thought.

Diagnosis
Symptoms of plague are usually non-specific and to definitively diagnose plague, laboratory testing is required. Y. pestis can be identified through both a microscope and by culturing a sample and this is used as a reference standard to confirm that a person has a case of plague. The sample can be obtained from the blood, mucus (sputum), or aspirate extracted from inflamed lymph nodes (buboes). If a person is administered antibiotics before a sample is taken or if there is a delay in transporting the person's sample to a laboratory and/or a poorly stored sample, there is a possibility for false negative results.

Polymerase chain reaction (PCR) may also be used to diagnose plague, by detecting the presence of bacterial genes such as the pla gene (plasmogen activator) and caf1 gene, (F1 capsule antigen). PCR testing requires a very small sample and is effective for both alive and dead bacteria. For this reason, if a person receives antibiotics before a sample is collected for laboratory testing, they may have a false negative culture and a positive PCR result.

Blood tests to detect antibodies against Y. pestis can also be used to diagnose plague, however, this requires taking blood samples at different periods to detect differences between the acute and convalescent phases of F1 antibody titres.

In 2020, a study about rapid diagnostic tests that detect the F1 capsule antigen (F1RDT) by sampling sputum or bubo aspirate was released. Results show rapid diagnostic F1RDT test can be used for people who have suspected pneumonic and bubonic plague but cannot be used in asymptomatic people. F1RDT may be useful in providing a fast result for prompt treatment and fast public health response as studies suggest that F1RDT is highly sensitive for both pneumonic and bubonic plague. However, when using the rapid test, both positive and negative results need to be confirmed to establish or reject the diagnosis of a confirmed case of plague and the test result needs to be interpreted within the epidemiological context as study findings indicate that although 40 out of 40 people who had the plague in a population of 1000 were correctly diagnosed, 317 people were diagnosed falsely as positive.

Vaccination
Bacteriologist Waldemar Haffkine developed the first plague vaccine in 1897. He conducted a massive inoculation program in British India, and it is estimated that 26 million doses of Haffkine's anti-plague vaccine were sent out from Bombay between 1897 and 1925, reducing the plague mortality by 50–85%.

Since human plague is rare in most parts of the world as of 2023, routine vaccination is not needed other than for those at particularly high risk of exposure, nor for people living in areas with enzootic plague, meaning it occurs at regular, predictable rates in populations and specific areas, such as the western United States. It is not even indicated for most travellers to countries with known recent reported cases, particularly if their travel is limited to urban areas with modern hotels. The United States CDC thus only recommends vaccination for (1) all laboratory and field personnel who are working with Y. pestis organisms resistant to antimicrobials: (2) people engaged in aerosol experiments with Y. pestis; and (3) people engaged in field operations in areas with enzootic plague where preventing exposure is not possible (such as some disaster areas). A systematic review by the Cochrane Collaboration found no studies of sufficient quality to make any statement on the efficacy of the vaccine.

Early diagnosis
Diagnosing plague early leads to a decrease in transmission or spread of the disease.

Prophylaxis
Pre-exposure prophylaxis for first responders and health care providers who will care for patients with pneumonic plague is not considered necessary as long as standard and droplet precautions can be maintained. In cases of surgical mask shortages, patient overcrowding, poor ventilation in hospital wards, or other crises, pre-exposure prophylaxis might be warranted if sufficient supplies of antimicrobials are available.

Postexposure prophylaxis should be considered for people who had close (<6 feet), sustained contact with a patient with pneumonic plague and were not wearing adequate personal protective equipment. Antimicrobial postexposure prophylaxis also can be considered for laboratory workers accidentally exposed to infectious materials and people who had close (<6 feet) or direct contact with infected animals, such as veterinary staff, pet owners, and hunters.

Specific recommendations on pre- and post-exposure prophylaxis are available in the clinical guidelines on treatment and prophylaxis of plague published in 2021.

Treatments
If diagnosed in time, the various forms of plague are usually highly responsive to antibiotic therapy. The antibiotics often used are streptomycin, chloramphenicol and tetracycline. Amongst the newer generation of antibiotics, gentamicin and doxycycline have proven effective in monotherapeutic treatment of plague. Guidelines on treatment and prophylaxis of plague were published by the Centers for Disease Control and Prevention in 2021.

The plague bacterium could develop drug resistance and again become a major health threat. One case of a drug-resistant form of the bacterium was found in Madagascar in 1995. Further outbreaks in Madagascar were reported in November 2014 and October 2017.

Epidemiology
Globally about 600 cases are reported a year. In 2017, the countries with the most cases include the Democratic Republic of the Congo, Madagascar and Peru. It has historically occurred in large outbreaks, with the best known being the Black Death in the 14th century which resulted in more than 50 million dead. In recent years, cases have been distributed between small seasonal outbreaks which occur primarily in Madagascar, and sporadic outbreaks or isolated cases in endemic areas.

In 2022 the possible origin of all modern strands of Yersinia pestis DNA was found in human remains in three graves located in Kyrgyzstan, dated to 1338 and 1339. The siege of Caffa in Crimea in 1346, is known to have been the first plague outbreak with following strands, later to spread over Europe. Sequencing DNA compared to other ancient and modern strands paints a family tree of the bacteria. Bacteria today affecting marmots in Kyrgyzstan, are closest to the strand found in the graves, suggesting this is also the location where plague transferred from animals to humans.

Biological weapon
The plague has a long history as a biological weapon. Historical accounts from ancient China and medieval Europe details the use of infected animal carcasses, such as cows or horses, and human carcasses, by the Xiongnu/Huns, Mongols, Turks and other groups, to contaminate enemy water supplies. Han dynasty general Huo Qubing is recorded to have died of such contamination while engaging in warfare against the Xiongnu. Plague victims were also reported to have been tossed by catapult into cities under siege.

In 1347, the Genoese possession of Caffa, a great trade emporium on the Crimean peninsula, came under siege by an army of Mongol warriors of the Golden Horde under the command of Jani Beg. After a protracted siege during which the Mongol army was reportedly withering from the disease, they decided to use the infected corpses as a biological weapon. The corpses were catapulted over the city walls, infecting the inhabitants. This event might have led to the transfer of the Black Death via their ships into the south of Europe, possibly explaining its rapid spread.

During World War II, the Japanese Army developed weaponized plague, based on the breeding and release of large numbers of fleas. During the Japanese occupation of Manchuria, Unit 731 deliberately infected Chinese, Korean and Manchurian civilians and prisoners of war with the plague bacterium. These subjects, termed "maruta" or "logs", were then studied by dissection, others by vivisection while still conscious. Members of the unit such as Shiro Ishii were exonerated from the Tokyo tribunal by Douglas MacArthur but 12 of them were prosecuted in the Khabarovsk War Crime Trials in 1949 during which some admitted having spread bubonic plague within a 36 km radius around the city of Changde.

Ishii innovated bombs containing live mice and fleas, with very small explosive loads, to deliver the weaponized microbes, overcoming the problem of the explosive killing the infected animal and insect by the use of a ceramic, rather than metal, casing for the warhead. While no records survive of the actual usage of the ceramic shells, prototypes exist and are believed to have been used in experiments during WWII.

After World War II, both the United States and the Soviet Union developed means of weaponising pneumonic plague. Experiments included various delivery methods, vacuum drying, sizing the bacterium, developing strains resistant to antibiotics, combining the bacterium with other diseases (such as diphtheria), and genetic engineering. Scientists who worked in USSR bio-weapons programs have stated that the Soviet effort was formidable and that large stocks of weaponised plague bacteria were produced. Information on many of the Soviet and US projects is largely unavailable. Aerosolized pneumonic plague remains the most significant threat.

The plague can be easily treated with antibiotics. Some countries, such as the United States, have large supplies on hand if such an attack should occur, making the threat less severe.

license: Creative Commons - Attribution Share-Alike - https://creativecommons.org/licenses/by-sa/4.0/

title: Plague (disease)


text:
Baudot code

The Baudot code is an early character encoding for telegraphy invented by Émile Baudot in the 1870s. It was the predecessor to the International Telegraph Alphabet No. 2 (ITA2), the most common teleprinter code in use before ASCII. Each character in the alphabet is represented by a series of five bits, sent over a communication channel such as a telegraph wire or a radio signal by asynchronous serial communication. The symbol rate measurement is known as baud, and is derived from the same name.

Baudot code (ITA1)
In the below table, Columns I, II, III, IV, and V show the code; the Let. and Fig. columns show the letters and numbers for the Continental and UK versions; and the sort keys present the table in the order: alphabetical, Gray and UK

Baudot developed his first multiplexed telegraph in 1872 and patented it in 1874. In 1876, he changed from a six-bit code to a five-bit code, as suggested by Carl Friedrich Gauss and Wilhelm Weber in 1834, with equal on and off intervals, which allowed for transmission of the Roman alphabet, and included punctuation and control signals. The code itself was not patented (only the machine) because French patent law does not allow concepts to be patented.

Baudot's 5-bit code was adapted to be sent from a manual keyboard, and no teleprinter equipment was ever constructed that used it in its original form. The code was entered on a keyboard which had just five piano-type keys and was operated using two fingers of the left hand and three fingers of the right hand. Once the keys had been pressed, they were locked down until mechanical contacts in a distributor unit passed over the sector connected to that particular keyboard, at which time the keyboard was unlocked ready for the next character to be entered, with an audible click (known as the "cadence signal") to warn the operator. Operators had to maintain a steady rhythm, and the usual speed of operation was 30 words per minute.

The table "shows the allocation of the Baudot code which was employed in the British Post Office for continental and inland services. A number of characters in the continental code are replaced by fractionals in the inland code. Code elements 1, 2 and 3 are transmitted by keys 1, 2 and 3, and these are operated by the first three fingers of the right hand. Code elements 4 and 5 are transmitted by keys 4 and 5, and these are operated by the first two fingers of the left hand."

Baudot's code became known as the International Telegraph Alphabet No. 1 (ITA1). It is no longer used.

Murray code
In 1901, Baudot's code was modified by Donald Murray (1865–1945), prompted by his development of a typewriter-like keyboard. The Murray system employed an intermediate step: an operator used a keyboard perforator to punch a paper tape and then a transmitter to send the message from the punched tape. At the receiving end of the line, a printing mechanism would print on a paper tape, and/or a reperforator would make a perforated copy of the message.

Because there was no longer a connection between the operator's hand movement and the bits transmitted, there was no concern about arranging the code to minimize operator fatigue. Instead, Murray designed the code to minimize wear on the machinery by assigning the code combinations with the fewest punched holes to the most frequently used characters. For example, the one-hole letters are E and T. The ten two-hole letters are AOINSHRDLZ, very similar to the "Etaoin shrdlu" order used in Linotype machines. Ten more letters, BCGFJMPUWY, have three holes each, and the four-hole letters are VXKQ.

The Murray code also introduced what became known as "format affectors" or "control characters" – the CR (Carriage Return) and LF (Line Feed) codes. A few of Baudot's codes moved to the positions where they have stayed ever since: the NULL or BLANK and the DEL code. NULL/BLANK was used as an idle code for when no messages were being sent, but the same code was used to encode the space separation between words. Sequences of DEL codes (fully punched columns) were used at start or end of messages or between them which made it easier to separate distinct messages. (BELL codes could be inserted in those sequences to signal to the remote operator that a new message was coming or that transmission of a message was terminated).

Early British Creed machines also used the Murray system.

Western Union
Murray's code was adopted by Western Union which used it until the 1950s, with a few changes that consisted of omitting some characters and adding more control codes. An explicit SPC (space) character was introduced, in place of the BLANK/NULL, and a new BEL code rang a bell or otherwise produced an audible signal at the receiver. Additionally, the WRU or "Who aRe yoU?" code was introduced, which caused a receiving machine to send an identification stream back to the sender.

ITA2
In 1932, the CCITT introduced the International Telegraph Alphabet No. 2 (ITA2) code as an international standard, which was based on the Western Union code with some minor changes. The US standardized on a version of ITA2 called the American Teletypewriter code (US TTY) which was the basis for 5-bit teletypewriter codes until the debut of 7-bit ASCII in 1963.

Some code points (marked blue in the table) were reserved for national-specific usage.

The code position assigned to Null was in fact used only for the idle state of teleprinters. During long periods of idle time, the impulse rate was not synchronized between both devices (which could even be powered off or not permanently interconnected on commuted phone lines). To start a message it was first necessary to calibrate the impulse rate, a sequence of regularly timed "mark" pulses (1), by a group of five pulses, which could also be detected by simple passive electronic devices to turn on the teleprinter. This sequence of pulses generated a series of Erasure/Delete characters while also initializing the state of the receiver to the Letters shift mode. However, the first pulse could be lost, so this power on procedure could then be terminated by a single Null immediately followed by an Erasure/Delete character. To preserve the synchronization between devices, the Null code could not be used arbitrarily in the middle of messages (this was an improvement to the initial Baudot system where spaces were not explicitly differentiated, so it was difficult to maintain the pulse counters for repeating spaces on teleprinters). But it was then possible to resynchronize devices at any time by sending a Null in the middle of a message (immediately followed by an Erasure/Delete/LS control if followed by a letter, or by a FS control if followed by a figure). Sending Null controls also did not cause the paper band to advance to the next row (as nothing was punched), so this saved precious lengths of punchable paper band. On the other hand, the Erasure/Delete/LS control code was always punched and always shifted to the (initial) letters mode. According to some sources, the Null code point was reserved for country-internal usage only.

The Shift to Letters code (LS) is also usable as a way to cancel/delete text from a punched tape after it has been read, allowing the safe destruction of a message before discarding the punched band. Functionally, it can also play the same filler role as the Delete code in ASCII (or other 7-bit and 8-bit encodings, including EBCDIC for punched cards). After codes in a fragment of text have been replaced by an arbitrary number of LS codes, what follows is still preserved and decodable. It can also be used as an initiator to make sure that the decoding of the first code will not give a digit or another symbol from the figures page (because the Null code can be arbitrarily inserted near the end or beginning of a punch band, and has to be ignored, whereas the Space code is significant in text).

The cells marked as reserved for extensions (which use the LS code again a second time—just after the first LS code—to shift from the figures page to the letters shift page) has been defined to shift into a new mode. In this new mode, the letters page contains only lowercase letters, but retains access to a third code page for uppercase letters, either by encoding for a single letter (by sending LS before that letter), or locking (with FS+LS) for an unlimited number of capital letters or digits before then unlocking (with a single LS) to return to lowercase mode. The cell marked as "Reserved" is also usable (using the FS code from the figures shift page) to switch the page of figures (which normally contains digits and national lowercase letters or symbols) to a fourth page (where national letters are uppercase and other symbols may be encoded).

ITA2 is still used in telecommunications devices for the deaf (TDD), Telex, and some amateur radio applications, such as radioteletype ("RTTY"). ITA2 is also used in Enhanced Broadcast Solution, an early 21st-century financial protocol specified by Deutsche Börse, to reduce the character encoding footprint.

Nomenclature
Nearly all 20th-century teleprinter equipment used Western Union's code, ITA2, or variants thereof. Radio amateurs casually call ITA2 and variants "Baudot" incorrectly, and even the American Radio Relay League's Amateur Radio Handbook does so, though in more recent editions the tables of codes correctly identifies it as ITA2.

Character set
The values shown in each cell are the Unicode codepoints, given for comparison.

Weather code
Meteorologists used a variant of ITA2 with the figures-case symbols, except for the ten digits, BEL and a few other characters, replaced by weather symbols:

Details
Note: This table presumes the space called "1" by Baudot and Murray is rightmost, and least significant. The way the transmitted bits were packed into larger codes varied by manufacturer. The most common solution allocates the bits from the least significant bit towards the most significant bit (leaving the three most significant bits of a byte unused). In ITA2, characters are expressed using five bits. ITA2 uses two code sub-sets, the "letter shift" (LTRS), and the "figure shift" (FIGS). The FIGS character (11011) signals that the following characters are to be interpreted as being in the FIGS set, until this is reset by the LTRS (11111) character. In use, the LTRS or FIGS shift key is pressed and released, transmitting the corresponding shift character to the other machine. The desired letters or figures characters are then typed. Unlike a typewriter or modern computer keyboard, the shift key isn't kept depressed whilst the corresponding characters are typed. "ENQuiry" will trigger the other machine's answerback. It means "Who are you?"

CR is carriage return, LF is line feed, BEL is the bell character which rang a small bell (often used to alert operators to an incoming message), SP is space, and NUL is the null character (blank tape).

Note: the binary conversions of the codepoints are often shown in reverse order, depending on (presumably) from which side one views the paper tape. Note further that the "control" characters were chosen so that they were either symmetric or in useful pairs so that inserting a tape "upside down" did not result in problems for the equipment and the resulting printout could be deciphered. Thus FIGS (11011), LTRS (11111) and space (00100) are invariant, while CR (00010) and LF (01000), generally used as a pair, are treated the same regardless of order by page printers. LTRS could also be used to overpunch characters to be deleted on a paper tape (much like DEL in 7-bit ASCII).

The sequence RYRYRY... is often used in test messages, and at the start of every transmission. Since R is 01010 and Y is 10101, the sequence exercises much of a teleprinter's mechanical components at maximum stress. Also, at one time, fine-tuning of the receiver was done using two coloured lights (one for each tone). 'RYRYRY...' produced 0101010101..., which made the lights glow with equal brightness when the tuning was correct. This tuning sequence is only useful when ITA2 is used with two-tone FSK modulation, such as is commonly seen in radioteletype (RTTY) usage.

US implementations of Baudot code may differ in the addition of a few characters, such as #, & on the FIGS layer.

The Russian version of Baudot code (MTK-2) used three shift modes; the Cyrillic letter mode was activated by the character (00000). Because of the larger number of characters in the Cyrillic alphabet, the characters !, &, £ were omitted and replaced by Cyrillics, and BEL has the same code as Cyrillic letter Ю. The Cyrillic letters Ъ and Ё are omitted, and Ч is merged with the numeral 4.

title: Baudot code


text:
Blu Tack

Blu Tack is a reusable putty-like pressure-sensitive adhesive produced by Bostik, commonly used to attach lightweight objects (such as posters or sheets of paper) to walls, doors or other dry surfaces. Traditionally blue, it is also available in other colours. Generic versions of the product are also available from other manufacturers. The spelling now used is without a hyphen.

The composition is described as a synthetic rubber compound without hazardous properties under normal conditions. It can be swallowed without harm and is not carcinogenic. It is non-soluble and is denser than water. The material is not flammable, but emits carbon dioxide and carbon monoxide when exposed to fire or high temperatures.

As of 2015, Bostik was manufacturing around 100 tonnes of Blu Tack weekly at its Leicester factory.

History
While the inventor of the commercial Bostik product is unknown, a precursor was created around 1970 as an accidental by-product of an attempt to develop a sealant based on chalk powder, rubber and oil. Blu Tack was originally white, but following fears that children could mistake it for chewing gum, a blue colouring was added.

In the United Kingdom in March 2008, 20,000 numbered packs of pink Blu Tack were made available, to help raise money for Breast Cancer Campaign, with 10 pence from each pack going to the charity. The formulation was slightly altered to retain complete consistency with its blue counterpart. Since then, many coloured variations have been made, including red and white, yellow, and a green Halloween pack.

Similar products
Similar products of various colours are made by many manufacturers, including Faber-Castell's "Tack-it", Henkel's "Fun-Tak", UHU's "Poster Putty" and "Sticky Tack", UFO's "Dough Tack", "Gummy Sticker" Pritt's "Sticky Stuff", Bostik's "Prestik" and Elmer's "Poster Tack". Plasti-Tak by Brooks Manufacturing Company appears to pre-date Blu Tack, with a trademark registration in 1964.

Versions of the product are also sold under the generic names "adhesive putty" and "mounting putty". The generic trademark or common name for mounting putty varies by region. It is known as "Patafix" in France, Italy, Portugal, Austria and Turkey, kennaratyggjó in Iceland and lærertyggis in Norway (both meaning "teacher's chewing gum"), häftmassa ("attachment paste") or kludd in Sweden, and wondergom in South Africa (an Afrikaans word, literally translated as "wonder glue").

Alternative uses
Like all poster putties, Blu Tack provides an alternative to the artist's traditional kneaded eraser.

Blu Tack was often used with the Sinclair ZX81 microcomputer to help mitigate crashes caused by wobbly external RAM modules. This was such a widespread problem that Sinclair Research's technical support department officially recommended the use of Blu Tack to resolve this issue.

In 2007 the artist Elizabeth Thompson created a 200 kg sculpture of a house spider using Blu Tack over a wire frame. It was exhibited at London Zoo.

Blu Tack can be used as a damping agent for sound and vibration applications, due to its low amplitude response properties. A 2013 study concluded that the substance is a comfortable alternative to over-the-counter ear plugs for the attenuation of everyday sound.

The New Zealand Government Earthquake Commission recommends that products such as Blu Tack should be used to prevent ornaments and small household items from falling or moving in the event of an earthquake.

Blu Tack is sometimes used by electronic hobbyists to hold through-hole electronic components in position for soldering onto PC-boards.

title: Blu Tack