The environment is not exactly made for humans. There are more things in Africa that can kill you than the rest of the world combined. In Africa, only the strongest survive. Survival was always the priority, development a distant second.
Furthermore, other nations could develop quickly because of the ability to travel. This is very hard in Africa because there are virtually no rivers that allow for easy travel. This made it almost impossible to exchange information. So every community had to invent basic things (like the wheel) themselves.
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