Because the constitution requires state and national government to be united, but each having it's own power. The constitution also states that no one person should have too much power, nor should any branch or state have too much power, so the power is split evenly.
The sense of togetherness. Almost all countries in Africa have close-knit communities. this might be considered as one of the factors.
He believed in democracy and a government ruled by the people. Even though this was his greatest moment, he didn't want to make himself a king
B because im pretty sure that was his main goal at task
Could we have a look at the sources?