African DNA and the South
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Interesting and thought-provoking study.
"It turns out that self-identified white people who live in the South have the highest concentrations of African DNA....
In South Carolina and Louisiana — the states shaded the darkest green on the map above — researchers found that one in 20 people who called themselves white had at least 2 percent African ancestry. And in a lot of the South, about 10 percent of people who identified as white turned out to have African DNA."
It seems that the mixing of the races in the South was pinpointed to the early 1800's when slavery was established as legal and the long estabished historical fact of white slave owners raping their captives.
http://www.vox.com/2014/12/22/7431391/guess-where-white-americans-have-the-most-african-ancestry
