This document provides an overview of the origins and early history of Islam based on chapter 9 of the textbook "A History of World Societies". It discusses the social environment in Arabia that Muhammad arose from and the key beliefs and practices he taught. It then summarizes the rapid expansion of the Islamic empire after Muhammad's death and the establishment of the Umayyad and Abbasid caliphates. The document also briefly outlines the fragmentation of Islamic lands, rise of new dynasties, and military challenges such as the Crusades and Mongol invasions between 900-1400 CE.