Since at least the Lower Paleolithic Period, interregional interaction has been fundamental to the development of cultures from around the world. The movement of ideas, people, and objects across vast areas is not confined to the modern era, and in this course we will explore the role that interregional interaction has played in many of the most important processes in human history from the dispersal of Homo Erectus, the beginnings of social inequality, the origins of agriculture, the birth of cities, and the spread of civilizations.