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Africans evolved to be impulsive and selfish because it was an advantage in a hostile place like Africa but terrible when in a civilization.

Just think of being in Africa, you may see food once a month, if you start thinking or question morality the food is already been eaten by someone else. Thus only one type reproduced.

After all Africa is a shitty place, that race only survived because nibody else wanted to live there, which is why contacts were made only after navigation improved.