I think even Neanderthals must have had an IQ above 85 to survive, although they did die out so maybe 90 was their max. Sorry for the rambling...
Yeah it’s really hard to argue that IQ doesn’t play a significant role in the activities of the American Negro culture when you have as proof nearly the ENTIRE continent of Africa (the sub Saharan countries anyway) that has remained essentially unchanged for the last 2 million years or so. Some of these African nations have average IQs in the low 60s! The only parts of Africa to show any evidence of human progress are the few remaining vestiges of British colonization, otherwise the natives are still wearing grass skirts and living in mud huts. IQ has EVERYTHING to do with Negro culture.