How do you know that? First, Europeans killed millions of Africans in the process of conquering the continent. Second, Africa may well have developed organically if left alone, possibly by borrowing what works in Western civilization. For all we know the people would be much better off now if the European conquest hadn't happened.
Apartheid left a damaged nation today and really it's the Whites fault for never involving the Blacks in the political process until 1994. To me, what's even more amazing is that the Afrikaners are refusing to move out of the continent. (I know that South Africa is their true home since they've been there since 1652