It turns out that if you cluster people together by their genetic information, the clusters that form are pretty similar to the racial groupings that ordinary Americans would understand. See this chart: https://en.wikipedia.org/wiki/Human_genetic_clustering#/medi...
The 4 clusters in the K=4 column are pretty much just Black vs White vs (east) Asian vs Amerindian
The 4 clusters in the K=4 column are pretty much just Black vs White vs (east) Asian vs Amerindian