Well I can tell you one comforting lie that the people on this board are clinging to...
The slavers' apologists lie that Whites did not go to Africa and abduct free Africans for the slave trade.
The historic record documents White (particualrly the Portuguese) sending raiding parties into Africa specifically to abduct Africans.
Some Arabs have done that for centuries, and we're informed some are still doing that even today.
Africa has been dealing with a econological disaster for over 2000 years.
The desertification of Northern Africa pretty much destroyed the great civilizations that once flourished there.
My history of Africa is, I'll admit, more than just little sketchy.
But as far as I can tell, it's not a place likely to develop great civilizations mostly due to the climate and topography of the place.
Oh I know that there were once fairly wealthy internal African cultures (Timbuktu, for example, eh?) but those died, as often happens when trade routes cease to be relevant.
It's pretty hard to develop truly thriving cultures when every fifty years the desert swallows up your villiages, I suspect.