Here I am using language as a belated indicator of genetic lineage. Technically, an ethnic group may have recently adopted a more global language such as english or french, abandoning their native tongue, but in the past the same ethnicity would have spoken their own language, and had significant genetic uniqueness. As the ethnic lineage is absorbed by the larger gene pool, their native language might indicate a historical genetic uniqueness.

Number of nearly extinct languages
Africa (46 total)
The Americas (170 total)
Asia (78 total)
Europe (12 total)
The Pacific (210 total)

Nearly Extinct Languages

Notice that there are a larger number of nearly extinct languages in the Americas and the Pacific, and fewest in Europe, Africa and Asia. This suggests that a greater spectrum of ethnicities survived the further away from Europe they were. In other words, a wave of colonization swept outward from Europe in the recent past. This is part of recorded history. And of course something similar must have happened genetically over the last 2 million years as a wave of "genetic" assimilation swept out from Africa. But the plethora of languages (and probably ethnicities and species) pre-existed this event. There was always a huge number of small ethnicities everywhere in the world.

I could qualify that as well.... It is possible that any primate even remotely resembling humans only existed in one geographic location at some point in the super-ancient past. Like kangaroos only live in Australia. But I think that 2 million years ago our ancestors, and all their cousins had already left Africa and colonized the world. If primates had ever been confined to one region it was probably hundreds of millions of years ago. But I doubt they ever were, because primates are so closely related to rodents, and of course they are everywhere.