Who are the three important African Kingdoms?

The fourteenth amendment how did the action resolve a longstanding conflict in post-civil war america? it defined the process for readmittance of the former confederate states into the united states of america. it ensured the right to vote to all male citizens of the united states, regardless of race, color, or prior servitude. it defined citizenship and related rights for african americans. it abolished slavery in the united states.

What was the most important consequence of the large-scale ecological changes in africa two hundred thousand years ago?

Which would be good historical evidence when studying manifest destiny?