Why did Sumer’s city-states have growing economies? Choose three answers.City leaders saved their money instead of building expensive city walls and ziggurats.Kings raised money by collecting taxes and then spent the money to improve the city.The use of agriculture and irrigation resulted in a surplus of food.City-states traded with each other for the things they needed.City-states avoided going to war with each other.

Sumerian city-states grew economically because rulers collected taxes and used the revenue to improve their cities. Agriculture supported by irrigation produced a surplus of food, leaving resources available beyond what people needed to survive. Trade between city-states also helped them obtain goods they lacked and expand their economies. The choices about saving money instead of building walls and ziggurats, and avoiding wars, do not describe the main causes listed here.

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