Quite a few countries had a choice between becoming South Africa or Zaire.
I do distinctly recall Belgian government in the 60's having a phased plan for independence, where they would build up the country and actually build up a pluralist-minded ruling elite, who would little by little take-over and assume control, starting with the municipal administrative regions. Elections would be held repeatedly while still under Belgian sovereignty, which would make sure that those who ventured politics in Congo were not unaccountable warlords or people with blatant disregard for the rule of Law or autocratic tendencies. So as the people and ruling elites would gain some measure of pluralist culture over the decades, with the appearance of different parties et al. and the appearance of accountability of the Congo politicians to the people, Congo would become actually a viable country, some sort of African Brazil. Instead the elites wanted immediate power, played upon the frustrations of the people, and massacred enough Belgians that the events surpassed the Belgian plans and they got what they wanted: Total and immediate power. The rest of the history can be guessed. It's just about the same thing as your average African country. Worse even.
Plans had been made for roughly the same purpose in the Portuguese African colonies.
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