In mulling over my reading about the origins and spread of humanity during the past 100 millennia, I was struck by a big difference with the Grand Canyon peoplescape before the arrival of whitefolk.
Writing about early homo sapiens speaks largely as if people then were much like each other; the talk is in generalities. I suppose this is because there is very little information about individual societies or cultures 50 millennia ago. We know that there must have been differences; but they mostly left no discoverable traces. We also know, though, that differences in physical appearance have developed, though overall we deny that these are significant indicators of capability. There might be differences in hair texture or color or body build, but these are no longer considered the markers of "racial quality" that they used to be. Recently, some anthropological work has suggested some contribution to the current human genome from Neanderthal, Denisovian, and potentially other hominids we met up with as we moved around. In general, though, detecting differences between human groups is either too difficult or too speculative or too much a fantasy of prejudice.