West, just by the fact of existing, messed up Africa.
Before white men's ships arrived, Africans were living in their tribal villages leading simple agricultural or hunter/gatherer lives. Just as people all over the world have been doing for ten thousand years. It was no paradise, but they had a balance with natural forces where the population wouldn't grow faster than the food supply.
Then comes the white man with his antibiotics and high-yielding maize (which he got from the New World Indians, but that's another story). Suddenly infant mortality went down and crop yields went up and population could grow like crazy. But Africans never developed the institutions and social structures necessary to support a densely populated society that the Europeans and East Asians did. African nations today still run pretty much like they did thousands of years ago, local warlords taking power. Except now it's millions of people instead of a few villages.
Africans would've been infinitely better off left completely to their own devices. Would they still be living in stone age primitive societies? Yes. Would it be preferable to what they have now? Yes.