I’ve heard that Nigerian immigrants are more successful in U.S. than any other group.....
That seems to be a generality that has been observed by many. It is an uncomfortable observation but in the early 20th century someone (I have the reference somewhere) postulated that the intellectual state of the American Negro differs from the Africans because the slaves harvested in Africa were not the cream of the crop (to be generous). Genetics take it from there ...
Yes, they are go-getters: study hard, find all the best angles.