Snowdon is a dummy

The government says it stores everybody’s phone records for five years. Cole explained that because the phone companies don’t keep records that long, the NSA had to build its own database.

Biomedical research and medical practice demands that race and ethnicity be part and parcel of good health for all.

But they did keep track of where slaves came from. You just don't know your US history.

As Germany's interior minister faced a special select committee, another surveillance program - also called Prism - has come to light. Unlike its more famous global namesake, this Prism is said to be used in Afghanistan.
... ... ...
Elsewhere in Berlin, Interior Minister Hans-Peter Friedrich completed two days in front of the special committee for internal affairs on Wednesday, facing further questions after his impromptu visit to Washington at the weekend.

Opposition politicians, who see increasing mileage in the alleged NSA espionage activities, said after the session that Friedrich's appearance shed little light on proceedings.

"Everywhere people seem to accept the way the US side is acting with a shrug of the shoulders, while there's no clarity anywhere," Social Democrat parliamentarian Michael Hartmann said, adding that he felt the chancellor's office should be answering questions instead of the interior ministry.

"My personal impression: Before September 22, nothing is meant to be put on the table here," Green party politician Wolfgang Wieland said, naming the date of federal elections in Germany.

Friedrich has so far stressed the NSA's supposed contribution to stopping five terror plots in Germany, offering data on two of them to date, when discussing the issue. The minister controversially said on Monday that there was a "super-fundamental right" to protecting public safety that trumped even privacy laws.

African slavery[edit]
Main article: Slavery in Africa
Slavery was practiced in some parts of Africa,[16] Europe,[16] Asia[16] and the Americas before the beginning of the Atlantic slave trade. There is evidence that enslaved people from some African states were exported to other states in Africa, Europe and Asia prior to the European colonization of the Americas.[17] The African slave trade provided a large number of slaves to Europeans.[18][19]
The Atlantic slave trade was not the only slave trade from Africa, although it was the largest in volume and intensity. As Elikia M’bokolo wrote in Le Monde diplomatique: "The African continent was bled of its human resources via all possible routes. Across the Sahara, through the Red Sea, from the Indian Ocean ports and across the Atlantic. At least ten centuries of slavery for the benefit of the Muslim countries (from the ninth to the nineteenth).... Four million enslaved people exported via the Red Sea, another four million[20] through the Swahili ports of the Indian Ocean, perhaps as many as nine million along the trans-Saharan caravan route, and eleven to twenty million (depending on the author) across the Atlantic Ocean."[21]
According to John K. Thornton, Europeans usually bought enslaved people who were captured in endemic warfare between African states.[22] There were also Africans who had made a business out of capturing Africans from neighboring ethnic groups or war captives and selling them.[23] People living around the Niger River were transported from these markets to the coast and sold at European trading ports in exchange for muskets (matchlock between 1540–1606 but flintlock from then on) and manufactured goods such as cloth or alcohol.[24] However, the European demand for slaves provided a large new market for the already existing trade.[25] Further, while those held in slavery in their own region of Africa might hope to escape, those shipped away had little chance of returning to Africa.

Which country did most US slaves come from?
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Answer:
Answer African sources for U.S. slaves
Angola is the answer.

This question is difficult, because Africa during the slave trade did not have the same borders as today, or even have "countries". Also, much of the slave trade was illegal smuggling without records. However, colonial records do give us a rough idea. According to the table below, Nigeria and Angola were the source for most slaves in Virginia and South Carolina. However, the slaves could have been taken far inland and traded to the coasts. Note also that the two colonies got slaves from different sources. Other colonies probably also had different relations with companies and ships and therefore different sources. When African tribes and nations were at peace, they produced few slaves. When there were a lot of wars in an area, more slaves came from that area. In general, it is safe to say that U.S. slaves came from West Africa, mainly Nigeria, Ghana, Angola, Senegambia, and Congo.

The US obsession with 'race' comes from slavery, segregation and district gerrymandering, not from medical doctors. Most medical research is done through carefully controlled protocols and doesn't care about census data.

Senegambia 14.9 % 19.5 % Sierra Leone 5.3 % 6.8 % Windward Coast
(Ivory Coast) 6.3 % 16.3 % Gold Coast
(Ghana) 16.0 % 13.3 % Bight of Benin
(Nigeria) -- -- 1.6 % Bight of Biafra
(Nigeria) 37.7 % 2.1 % Angola
(Congo too?) 15.7 % 39.6 % Mozambique/
Madagascar 4.1 % 0.7 % Source: P. C. Curtin, The Atlantic Slave Trade: A Census (Madison: University of Wisconsin Press, 1969), p. 157.

The point is, historian have an idea of where slaves came from in aggregate numbers, thanks to boats and harbors' registries, but not where individual slaves came from. They were considered and treated like cattle, and whatever info is available is not at the individual level.

Which is why you know where precisely your ancestors came from, but most African Americans do not know that. They just know their origin as "somewhere in Africa".

DNA proves author Alex Haley had Scottish roots
DNA tests have proved that Alex Haley – the black American author whose book Roots traced his family origins from the slave plantations of the US back to Africa – was of Scottish ancestry.