I'd like to say something more about the African Union, if I may. It operates on the principle of subsidiarity. In other words, every sub-regional organization must get involved first and may then turn to the African Union for assistance.
In West Africa, for instance, the Economic Community of West African States is very active. Cameroon, however, is not in the sub-region of West Africa; rather, it is in the Central Africa sub-region. The member states of the Central African community are not as open because none of them has an English-speaking minority, so they aren't sensitive to the cultural diversity that exists in Cameroon.