I think that intelligence is genetic to an extent. I think that certain populations, as a result of being descendants of
successful ancient kingdoms/empires, inherited intelligence form their ancestors. Notice how a lot of the smartest Africans come from areas where
successful ancient empires used to exist (Songhai in mali, Oyo in Nigeria etc.). African kingdoms from central Africa weren't as successful as those from East and West Africa. I think that this has to do with the fact that as a kingdom becomes more advanced women become more picky with what kind of men they mate with. That is, the more advanced the society, the more women choose to mate with powerful men (who are often more cunning/intelligent then the other men). Ever noticed how the more advanced a country is the more picky the women are? Just look at Japan and Germany. Both countries have negative birth rates. In Japan the women aren't attracted to most men.
I also think that with Jews only the strongest (cunning/intelligent) Jews were able to pass on their genes. Jews have historically been hunted for sport by other humans. The Jews that survived were usually intelligent bankers who were able to pass on their genes
. Ancient Persia used to be a powerhouse back in the day.... notice how the smartest people in the middle east can be found in Iran (think of all the Iranians that work in Silicon valley,medicine, and wall street. Persians are over represented in these fiends tbh). I think that successful ancient empires had smart men that passed on their genes resulting in a greater share of smart people in those populations
. Nigerians, Mande,Jews,Japanese, Han Chinese, and Persians tend to have intelligent people
.
Honorable mention goes to Ethiopians, Egyptians, and cacs from Russia (all of these populations had successful ancient empires).