Why are majority of Arab Muslims intellectually advanced, but majority of Black African Muslims ( موالي‎‎) are intellectually re-tarded. See the difference between the Gulf nations and African nations.

When I see how the majority of Muslims in northern Nigeria are so intellectually re-tarded, while their elites are intellectually advanced, I weep.
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That is why they are ruled by herd mentality and often misled by their elites of the political ruling class from generation to generation.
Their elites send their children to the best Western oriented schools while the children of the "Talakawas" go to the neglected public schools or "Almajiris" centres at their mosques and living like dogs.