Things have fallen apart in Africa for a long time because of colonialism, capitalism, socialism, Marxism, communism, tribalism, ethnic chauvinism… neoliberalism, globalism and what have you. Things are in total free fall in Africa today because Africa has become a collection of vampiric states ruled by kleptocrats who have sucked it dry of its natural and human resources. It is easy to blame the white man and his colonialism, capitalism and all the other “isms” for Africa’s ailments, but as Cassius said to Brutus in Shakespeare’s Julius Caesar: “The fault, dear Brutus, is not in our stars, but in ourselves.” The fault is not in the African people, the African landscape or skyscape. Africa is rich and blessed with natural and human resources. The fault is in the African brutes and their vampiric regimes.
You can read the rest of Alemayehu G. Mariam's diagnosis here.