The Rise of Sumerian City-States

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1.
Mesopotamia
2.
River
3.
River
4.
Sumer
5.
irrigation
6.
levee
7.
silt
8.
city-state
9.
problem
10.
solution
11.
farmers
12.
hills
13.
plains
14.
geography
15.
Mountains
16.
foothills