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I'm not for sure if I'm correct but I think that it's because since most of Africa is the Sahara dessert that it was easier to transport things.
Trade routes
Africa Europe North America
gold
They brought cloth and horses to trade with the Africans.
Bananas
Around AD 750 the trade began
The triangular trade was bettween North America, Europe, and Africa.
Two reasons towns grew in West Africa are the decentralization and the trade with North America.
North America, Europe, and Africa
something
The Mediterranean Sea prevents trade between North Africa and Europe.