Which factors contributed to economic growth in Sumerian city-states? Choose four answers.having many gold minesgrowing a surplus of foodusing irrigation in farmingtrading between city-statesbeing located near riversbuilding homes with courtyards

Irrigation helped Sumerians grow more crops, and a surplus of food supported larger populations and freed some people to work in other jobs. The city-states also benefited from trading goods with one another and from being located near rivers, which provided water and routes for transport. Gold mines and courtyard homes were not key factors in Sumerian economic growth.

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