Nigeria in the SE is already at war with the Boko Haram and the Nigerian army which is basically the same thing. Nigeria is already wartorn.You don't know what you are writing about. There is a reason that France has had to stay in West Africa and keep the Mandingos disarmed. The Mandingos are not just in Mali you dumbass. Mande people are also in Ghana, Nigeria, Niger, Guinea, Ivory Coast, Sierra Leone, Burkina Faso, Liberia, etc.
Hell Ngeria would implode into civil war if war broke out across West Africa, because Nigeria is tribal.