In addition, they get for free perfect knowledge of English, work eligibility in the US and an extensive network of friends and relatives. Something that many immigrants can only dream about.
Educations are relative. Sure the inner city US education is good compared to Nigeria, but they arent going to be competing with Nigerians for college admissions and jobs. They will be competing with other Americans who got vastly superior free educations.
No it isn't, Nigeria remains a poor country since its population doesn't get proper education. That keeps them much poorer than for example USA. Poor people in USA can be relatively rich from a global perspective since they get so good education, you couldn't keep the wealth USA currently has if the bottom 40% couldn't read like is the case in Nigeria.
In addition, they get for free perfect knowledge of English, work eligibility in the US and an extensive network of friends and relatives. Something that many immigrants can only dream about.