The document provides an overview of early civilizations in Egypt and Mesopotamia. It discusses the common characteristics of these early civilizations including their development along major river valleys, use of irrigation for agriculture, presence of urban centers and hierarchical societies. Specific details are then given on the Mesopotamian civilizations of Sumerians, Akkadians, Babylonians and Assyrians as well as the unifying role of the Nile River in Egyptian civilization. Architecture, art, literature and the importance of religion are also summarized for Mesopotamia and Egypt.