from your link
it says:
"Educational attainment of Africans (14.5 years) is higher than Afro-
Caribbeans (12.8 years) or African Americans (12.5 years) – indeed, it is higher even
than whites and Asians. This suggests that black Africans immigrate selectively to the
U.S. based on their educational attainment or plans for higher education."
hmmm....
Interesting link, btw.