Correct. As we developed in and migrated out of africa, we were able to isolate

Correct.
As we developed in and migrated out of africa, we were able to isolate in the four regions of the continents and speciate into four primary races which largely consisted of increases in neoteny and decreases in aggression, combined with increasing utility of IQ which roughly equals rate of adaptation, which produced group differences that shrunk the lower classes and increased the average IQ of the group. Cold weather and farming that requires living in close proximity and long-term planning are brutal on lower IQs. So there is some absolute benefit to neotenic differences in the races, and some absolute benefit of reduction of underclasses with lower self-regulation and higher aggression. This pair of evolutionary processes created race differences in IQ. And hybrid subraces accurately reflect the admixture of the four primary races and their four speciation events.

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