Ethnic differences exist; of course they exist on the African continent. They are not necessarily political differences, however. They don't necessarily cause people to kill each other. They become so-called 'tribalism' when they are politicized in a particular framework. And in post-independence Africa they have been politicized largely by sections of the so-called African elite.
Walter RodneyNot only are there African accomplices inside the imperialist system, but every African has a responsibility to understand the system and work for its overthrow.
Walter RodneyAfter all, if there is no class stratification in a society, it follows that there is no state, because the state arose as an instrument to be used by a particular class to control the rest of society in its own interests.
Walter Rodney