I don't have beliefs, I possess knowledge. If you'd like to prove the intellectual capacity of sub-Saharan Africans and their diaspora is, as a group, equivalent to other population groups, be my guest.

Normally at this point, people like you will call me a "white supremacist" or some other ad-hominem so keep in mind the same studies that show the lagging performance of sub-Sarahan Africans also show exceedingly high performance (clearly above that of most European populations) for east asians and Ashkenazim Jews.