What led to the development of one-crop economies?

Why did river valleys most farming impact the lives of neolithic peoples?

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.

Can someone me write a paragraph on this topic i feel confused