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History teaches us that, in certain circumstances, it is quite easy for a stranger to impose his rule on a people. But history equally teaches us that, whatever the material aspects of that rule, it cannot be sustained except by the permanent and organized repression of the cultural life of the people in question. It can only firmly entrench itself if it physically destroys a significant part of the dominated people.
Amílcar Cabral (Tue,) studied this question.