Europe is alot more united, Africa's Problem don't go away that fast look at all the aid sent to them yet more corruption, more disease, etc etc I've Read UK gave 1 billion in Aid to an African Country and the leader spent the Money on his personal Airplane and luxury Items.
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And in a United Africa you won't see the North African Arab-Berbers Joining the Rest of Africa they very Much are likely to Join the ME.
I no its more united but my point was that it isnt totally united at the end of the day continental boundaries mean nothing its more about culture/values that united countrys not geographic location.