For a host of reasons, Tribal rather than national approaches, access to debt instruments beyond the ability to pay, just a host of reasons.
Sadly, only two things ever temporarily glued parts of Sub Saharan Africa together:
-Colonialism
-Communism
And thost NGO aid groups pretty much discourage local food production, how can they compete with “free”?
Same is true with several budding industries. I remember some African pleading to stop sending donated clothing to Africa. He was trying to get a textile manufacturing business going but could not compete with "free".