From the beginnings in 1870, American relations with Cambodia were rarely easy. In this abridged and updated version of his definitive history, Clymer examines the effects of U.S. interactions with Cambodia, tracing the disruptions that climaxed during the Vietnam War when U.S. planes bombed perceived enemy strongholds within Cambodia. The attacks led to Cambodia's involvement in the war and to civil war, from which the Khmer Rouge emerged victorious. Nearly one third of Cambodia's population died under the Khmer Rouge's genocidal rule. Clymer shows how diplomatic neglect, misperceptions, misunderstandings, and poorly conceived policies contributed to these tragic events. In the 1990s, the United States finally worked with the United Nations to broker the settlement of conflict in Cambodia.