The opportunity presented by European slave dealers became the major (though not the only) stimulus for a great deal of social violence between diffe… - Walter Rodney

The process by which Africa produced thirty-odd sovereign states was an extremely complex one, characterized by an interplay of forces and calculations on the part of various groups of Africans, on the part of the colonial powers, and on the part of interest groups inside the metropolis. [...] It must be stressed that the move for the regaining of independence was initiated by the African people; and, to whatever extent that objective was realized, the motor force of the people must be taken into account.

Apart from language, the pillar of cultural imperialism in most colonies was religion.

During the centuries of pre-colonial trade, some control over social, political, and economic life was retained in Africa, in spite of the disadvantageous commerce with Europeans. That little control over internal matters disappeared under colonialism. Colonialism went much further than trade. It meant a tendency towards direct appropriation by Europeans of the social institutions within Africa. Africans ceased to set indigenous cultural goals and standards, and lost full command of training young members of the society. Those were undoubtedly major steps backward.