This document provides an overview of early civilizations in four sections: 1) Mesopotamian civilization emerged by 3000 BCE in cities along the Tigris and Euphrates rivers, with complex social structures and writing developed by the Sumerians. 2) Ancient Egyptian civilization also emerged by 3200 BCE, centered around the pharaoh and bureaucracy rather than city-states. They developed hieroglyphic writing and religion. 3) Egypt and Mesopotamia had both similarities like stratified societies and differences like Egypt's centralized government versus Mesopotamian city-states. 4) Other early civilization centers included Kush in Africa, and the Minoans, Phoenicians, and