1. They have.
2. Sub-Saharan Africa doesn't have the required plants & animals that are needed to jump from a hunter gather society to an agricultural one.
If you stuck stone age White people in Africa they would likely be in a similar state. 
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1. Individual differences. Not racial. That means there are smart people and vegetables like you in every culture. 2.
End of conversation
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What's amazing is that he thinks %, even if true, could prove his case--even the ppl who accept that % say intelligence is absurdly polygenic, admit their studies from ppl of similar backgrounds, that IQ tests are culturally biased & genetic variation is pronounced within groups
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In other words, even assuming the 50%, which is disputable, genetic variation within groups is simply too high to lead to pronounced group differences, environmental results are still paramount, and IQ tests are still biased. This is before even taking a critical stance.
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I love the "Muh it's common sense!" argument. Are you sure that you are White? Because that sounds like a really low IQ argument right there buddy.