The standard answer is usually something like "100 million" or other crazy nonsense.
A more academic number is 11 million (which is all the slaves ever transported to the Western Hemisphere).
The shocking true answer: about 365,000. That's all.
About two thirds were men.
Yet, by 1860, there were 4.5 million African-Americans in the US.
There has been an enormous amount of mixture in the US - most African-Americans would be considered of mixed background in most South American and African countries.
That's because they are.
That's because they are.
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WELL put.