What caused problems in the newly independent african nations? lack of resources immigration natural disasters fighting among tribes

I believe the answer is: 

- fighting among tribes
In newly independent nations, there tend to be a vacuum that attracted many groups in competition to obtain the largest power, which caused the fight among tribes

- unstable governments
since there isn't legitimate government that acknowledged by the people, they cannot make a uniftying political actions that sink the country into disarrat

- issues resulting from the Cold War
The western and eastern block often seek alliances from these nations to strengthen their position in the cold war.