this is very interesting considering there is a large disagreement concerning all black american coming from africa as slaves or whatever during thoses time.On the other hand, 40% of the African-American sequences have no match among the nearly 4000 sequences taken from continental Africa. That's astounding to me, just from the standpoint of sampling.
the issue comes from people claiming that there were "black" americans here in america before the africans came and these "black" americans had been here for eons; they were one of the native groups inhabiting this lands way before columbus.
two peoples (that i know of) supporting this stance is the moors and the washitaw empire who were supposedly the ones who built the many "mounds" found on this continent.
anyone know more concerning this subject please add!!