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Understanding the connection between history and DNA is especially important for African Americans, because slavery and discrimination caused profound and relatively rapid demographic change.
Not surprisingly, the data shows that, for most African Americans, the majority of their DNA comes from African ancestors. The results also show that essentially all African Americans have some European ancestry ancestry as well. The genetic mix of African and European DNA, however, follows a striking geographical trend: African Americans living in Southern states have more African DNA (83 percent) than those living in other areas of the country (80 percent). Conversely, African Americans outside the South have a larger fraction of European DNA.
The researchers propose an interesting answer. They argue that the Great Migration of African Americans out of the South was genetically biased: African Americans with a higher fraction of European ancestry, who often have lighter skin, had better social opportunities and were thus in a better position to migrate to northern and Western states.
Read full, original post: How Slavery Changed the DNA of African Americans