Zimbabwe and S. Africa fucked themselves. They got home rule, put majority or completely Black radical Leftist governments in place and within months corruption, incompetence, and graft started. Within years, systems Whites built in those countries like roads, rail systems, agriculture, industry, all collapsed into ruin. Venezuela did the exact same thing. Cuba did the exact same thing.
Kicking the colonists out--and Whites in S. Africa did not have to conquer any Black tribes as no one was living there when they arrived. The Kalahari desert blocked movement there overland--has only made those nations, uniformly, worse off.
Haiti failed because the now free Black slaves that controlled it were a bunch of retards. Cuba has survived as an economic basket case of social and economic failure because of Communism. The radical Left fucks everything they touch up. They have the Crapper touch. Everything they touch turns to shit.