The idea of a politically united Africa, Pan-Africanism, has been around for over a hundred years. While the pan-african movement has been involved in anti-slavery and anti-colonial struggles and the fight against Apartheid South Africa, there has never been any significant movement towards a political unification. However, recent historical events, quite unexpectedly, may provide an impetus in this direction.

http://www.watchinghistory.com/2009/11/african-union.html