Answer:
The service of African-Americans in the military had dramatic implications for African-Americans. Black soldiers faced systemic racial discrimination in the army and endured virulent hostility upon returning to their homes at the end of the war.
Explanation:
The rivers flowed to the Byzantine Empire so the Russians were influenced by the Byzantine Empire.
Well, the Greeks were surrounded by mountains, so communication was very difficult. Though they had trouble communicating within their own city-states, they could use the sea for trade and to conquer other kingdoms.
Africa was stripped of many resources by the Europeans