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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Lol, yeah, because intelligence is as simple as someone's hight.
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. - 2 more replies
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Lol how about you link me that high school psychology literature buddy?
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Environment is not the primary influence on intelligence — https://en.m.wikipedia.org/wiki/Minnesota_Transracial_Adoption_Study …
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