If this were true, then Africa wouldn't have created many great empires. The Egyptians being one.
Egypt is probably the highest (or near the top) end when it comes to IQ in africa
Although it doesnt need a high IQ to build empires when you have access to armies of slave labour.
The smarter Egyptians (where average iq is 80) enslaved the lower IQ africans (where IQ is in the 60-70 range)
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