AH Challenge: United States of Africa

Your challenge, should you accept it, is to make an US of A, but this time it is Africa. By our time OTL, it should be as powerful as the OTL USA. Whether it is English, French, or Spanish Speaking is your own discion.

POD is 1500 AD. Be descriptive.
 
I actually have had a fairly detailed idea of a United States of Africa for a long time, with American interest in Liberia causing that state to expand rapidly, until, about a century and a half later, it surpassed America in power and became independent.
 
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