The document summarizes the Sumerian civilization that arose in Mesopotamia around 3000 BC. The Sumerians lived in city-states like Uruk and Ur and practiced polytheistic religion with gods like Enlil and Inanna playing important roles. Sargon conquered the Sumerian city-states and created the first empire in Mesopotamia through raising a permanent standing army. The Sumerians had an advanced society with social classes and infrastructure like canals and walls around their cities.