Two Mesopotamian city-states {Ans: Kish; Ur}Dams and reservoirs {Ans: Created to store water}Euphrates River {Ans: one of the two largest rivers in Mesopotamia}Sumerians {Ans: ancient people who lived in the geographic region of Sumer}The environment of Sumer was {Ans: low and flat, with little rain}What caused shortages in the foothills? {Ans: too much population}