Valley glaciers are formed when a glacier travels across and down a slope, carving the valley by the action of scouring.
Why might a post classical civilization want to conquer Mesopotamia? It's fertile land provided the foundation for the first human civilizations and its access to the Persian Gulf and location between Europe, Asia, and Africa made it a center of trade.
SOS:
<u><em>Sierra Leone</em></u> is the answer!
<em>Hope this helps!!</em>
Europe and America used slaves for labor so the slaves in America or Europe are subtracted from the South African population.