The interesting part is that humans go through different phases (decades/centuries), where different skills are required: Native Indians in Middle America weren't strong enough to work on the plantations, so Africans were brought in. Today there are probably more Africans living in the Carrebian, since they once made the money to attract a female, make it a wife (marry here, very important for women) and then have a family (kids), which some/most Native Americans maybe didn't achive, since no job/money (and thus no true love ;)