“Slavery and the slave trade, upon which Western Europe and the United States developed their economic superiority, were said to be positive for Africans, whose innate inferiority meant they had no capacity to run their own lives.”

Nobody believes that since the 1900's Gerald. Many African slaves were captured by other African tribes in intertribal warfare. These slaves formally sold to the Arabs were now sold to the better paying Europeans.

You put all the blame on western powers but completely ignore the impact of African corruption. You also ignore the fact that a lot of these African leaders were trained ibyBritish socialist on how to run a country.

They didn't do too well until the adopted more market oriented economies.