Are the West Africans in the USA the same ?
In the US all black immigrant groups do well. Ghanaians, Nigerians, and Kenyans have a head start over other Africans because of their English skills.
The runner Meb Keflezighi arrived in the US as a 12 year-old refugee from Eritrea not speaking a word of English. He graduated from UCLA at 23. Most of his ten siblings are college graduates. A sister has a medical degree from UCLA and a brother has a bachelors and a law degree from UCLA.
The first black Congresswoman, Shirley Chisholm, had a mother from Barbados and father from what is now Guyana.
The first black Secretary of State, Colin Powell, is the son of Jamaican immigrants. Barack Obama is the son of a Kenyan.