The document discusses the Mesopotamian civilization that arose between the Tigris and Euphrates Rivers in modern-day Iraq. It describes key characteristics of early civilizations including cities, agriculture, trade, religion, art, writing systems, and centralized governments. The document outlines the major cities of Mesopotamia, including Ur and Uruk, and religious structures like ziggurats. Causes for the decline of Mesopotamia included warfare between city-states and problems with their irrigation systems. The Egyptian civilization on the Nile River is also briefly mentioned.