The document provides an outline for a lecture on early river valley civilizations, focusing on the Sumerian civilization in Mesopotamia. The geography of the fertile crescent along the Tigris and Euphrates rivers supported the rise of city-states like Ur and Uruk. Each city had its own government and patron god. Sumerian culture included polytheistic religious beliefs reflected in texts like the Epic of Gilgamesh, a stratified social structure, and technological innovations like writing, the wheel, and bronze. Sargon of Akkad later established the first empire, uniting the region, while Hammurabi created a uniform legal code during the Babylonian empire that replaced earlier city-state laws