That is why pca is widely used to correct for population structure in gwas. Armando marti happens to be a college professor of history & anthropology in p. Not the puerto rico i lived and know. Aside from his phd on the subject, he has published several books, and given many talks on symposiums. The jewish mafia since 1898, the italian mafia since the 1920s, the cuban mafia since 1960, the colombian mafia since the 1970s, the dominican mafia since the 1990s.
Quantifying these relationships is a useful way to summarize the extent to which minority or historically oppressed populations — including new immigrants — are being economically, geographically and politically incorporated into american society and to which racial boundaries are breaking down. One might imagine, it says.