The document provides information about early civilizations in Mesopotamia and Egypt. It discusses the common characteristics of these early civilizations, including that they began along major river valleys and developed irrigation for agriculture. It also describes their hierarchical societies, use of slave labor, early legal codes, polytheistic religions, and the development of writing. Specific details are given about the civilizations that arose in Mesopotamia like the Sumerians, Akkadians, Babylonians and Assyrians. Their architecture, art, and early works of literature are also summarized.