What unites the civilizations of Egypt, Kush, Mali, and Benin?

they wanted the u.s. to fight on the side of the central powers.

disease was the number one killer of native peoples. they had had little exposure to the diseases of europe. this led to some villages being almost completely wiped out and some tribes destroyed.

d.)   when the us left nato after the end of the cold war and they had to evolve to focus on more humanitarian measures with the smaller budget