Why is it important to Black Africans, that proof is found that Black Africans built Great Zimbabwe and the cities along the eastern coast of Africa and not "whites" or Arabs?

Why is it problematic for historians to use oversimplification when writing about the past?

1. what was the result of growing nationalism and pan-africanism on european-african relations? africans were encouraged to seek independence from europe. european colonialism grew and strengthened in africa. the change of power from european to african rule went smoothly. africans believed they could live peacefully with europeans.

West africans received salt from who?