How did Sumerian city gain power?

Sumerian city-states gained power through a combination of agricultural innovation, trade, and military strength. The development of irrigation systems allowed for surplus food production, which supported larger populations and economic growth. Additionally, Sumerians established trade networks that facilitated the exchange of goods, ideas, and technologies, further enhancing their influence. Military prowess also played a crucial role, as city-states often competed for resources and territory, leading to the establishment of dominant power centers.