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- Problem #1 Enough food could not be produced in the foothills of zargos mountans because of population increase
- There was an uncontrolled water supply on the plans
- Problem #3 The irrigation system had to be maintained
- Solution #1 People moved out of the foothills and onto the plains's to farm the fertile land by rivers
- solution #2 The sumerians created irrigation systems with levees, canals, dams, and reservoirs
- Solution #3 People were forced to work together . As they worked together, they formed large communities
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