JHE
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Anyone got a sensible theory on why Africa seems to always suffer these problems?
One aspect of the problem in Africa is that many countries, with borders carved out by imperial powers, have the potential for inter-ethnic conflict built into them.
Such ugly potentials being bloodily realised is definitely NOT a peculiarly African problem. The Balkans are not in Africa! (That's just taking a recent European example - or set of examples. It would be easy to find other, greater examples and more distant examples.)