The document discusses the history and culture of Southeast Asia and some kingdoms that arose there. It focuses on the Khmer Empire in Cambodia, describing the Angkor Wat temple and the golden age of Khmer civilization between 889-1434 when the empire was at its greatest extent, building elaborate irrigation systems and architecture. It also briefly mentions Vietnam gaining independence in 939 and absorbing Buddhism from China, and the Koryo dynasty that ruled Korea from 935-1392, establishing a Confucian civil service and facing Mongol invasions.