Answer:
The use of agriculture and irrigation resulted in a surplus of food, City-states traded with each other for the things they needed,
Step-by-step explanation:
The Sumerian civilization flourished in the southern Mesopotamia. Sumer developed as city states and the Sumerians took an active role in the field of inventions and innovations. The city states flourished and grew with the trade of the agricultural products. They developed a good terms with the neighboring states. The agriculture and water management of the civilization helps in paving way to be a successful civilization. They analyzed the land and developed the best methods to increase the yield.