Most Black people in America, not all of them by far, refuse to look at Africa objectively. They refuse to acknowledge the rampant slavery, abuse, and torture, that happens there every day under brutal Black dictators. The Black racists in America such a Farrakhan claim that the cannibalism, slavery, dictatorships, perpetual tribal war, and primitive lifestyles, are all because of the White Man keeping them down. It has nothing to do with Black people, or Black African Culture. It is all because of colonialism and the White Man.
According to their incredibly warped point of view, Black people are superior to all other races. Without White/European Colonialism, Africa would dominate the world today! There is a grain of truth in this. Black people are superior to other races in some very narrow physical aspects. But intelligence/inventiveness/architecture is not one of these very narrow aspects. It is very unlikely that they would be even a smidgen better off if colonialism had never occurred.
A Black racist will never admit this, but colonialism was responsible for whatever very limited progress that has been made in Africa over the last thousand years. Without colonialism and Western exposure, they would still be living like Native Americans, in mud huts, and sharpening rocks to make a weapon. And America run by Black people without people of different races, would be the same as Africa in a decade. A broken, desolate, starving country, with institutionalized corruption and abuse.