This document provides an overview of early river valley civilizations including Mesopotamia, Egypt, Indus Valley, and China. It describes five key characteristics of civilization: advanced cities, specialized workers, complex institutions, record keeping, and advanced technology. For Mesopotamia, it discusses the advantages and disadvantages of the region, the rise of Sumerian city-states, and later empires including Akkad and Babylon. It also summarizes the early civilizations of ancient Egypt, Indus Valley, and dynasties of early China such as Shang and Zhou.