The spread of Islam into the Maghreb is an example of Arab invasion of North Africa. The Arabs send Muslim army to Maghreb (modern morocco) to battle against Byzantines and allies, and finally conquer most of the North Africa were many Berbers (locals of Maghreb) join the Muslim army. After Arabs gain more power in the region, the Berbers are now ready to adopt and convert to Islam as well as the Arabic culture.
Dwight D. Eisenhower was the commander during world war II in U.S.A.
Answer: Cymbals Castanets Trumpets Pipes.
Nobody chooses the rulers. If its through a system of heredity, when the rulers die their children take over.