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Your numbers about the trans-Atlantic slave trade are
hideously wrong and ignore all the slaves that weren't transported to mainland North America.
Estimates are that (at a minimum) 12-12.5 million Africans were enslaved and arrived in the Western Hemisphere as part of the trans-Atlantic slave trade. At least another 1.5 million perished during the crossings alone.
Around 460-470,000 African slaves arrived directly in mainland North America between 1619 and 1844. Another 30,000 to 45,000 were subject to secondary transport (i.e, they were shipped to one region and then moved again to North America).
Estimates are that
at least 10 million Africans and their descendants were enslaved in the 13 American colonies and the later USA in the roughly 250 years between the first arrivals and the 1865 outlawing of slavery. About 9.7 million to 9.9 million children of enslaved Africans were born into slavery themselves.
The first official US census in 1790 counted 697,624 slaves in the country. The eighth census in 1860 counted 3,953,760. This was an estimated 50% of the slaves in the entire Western hemisphere at the time.