when the original humans migrated and separately evolved into the different races, those traits they evolved are more favorable than the ones they originally had, and some of them more so than the others. case in point, when the europeans went back into africa (sub-sahara) and those inhabitants hadn't even invented the wheel at that point, and hardly any languages, too. the cold climates of asian and europe lead to the development of an advanced forebrain, capable of prolonging immediate gratification for future gain (the essence of farming, business, commerce, etc).
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