In OTL, the world is clearly dominated by Europeans (and their direct descendants in the New World) since the Age of Exploration till now. Almost all others were subjugated by them to varying degrees. IMO, geography, climate, resources are all factors which favorably predisposed them to domination since the dawn of history.
Nevertheless it is certainly plausible that instead of Europeans, East Asians, South Asians or Middle Easterners dominated instead, although at a significantly lower probability.
Due to late start and isolation, a world dominated by Amerindians is almost zero.
So that leaves sub-Saharan Africa.
With a prehistoric PoD, what is the probability of a world dominated by sub-Saharan Africans?