This book recasts the history of American empire in Southeast and East Asia from the Pacific War through the end of U.S. intervention in Vietnam. It argues that anticommunist nationalism in Southeast Asia intersected with pre-existing local antipathy toward China and the Chinese diaspora to usher the region from European-dominated colonialism into U.S. hegemony. Between the late 1940s and 1960s, Britain and its indigenous collaborators in Malaya and Singapore overcame the mostly Chinese communist parties of both countries by crafting a pro-West nationalism that was anticommunist by virtue of its anti-Chinese bent. London’s neocolonial schemes in Malaya and Singapore prolonged its influence in the region. But as British power waned, Malaya and Singapore’s anticommunist leaders cast their lot with the United States, mirroring developments in the Philippines, Thailand and, in the late 1960s, Indonesia. In effect, these five anticommunist states established, with U.S. support, a geostrategic arc of containment that encircled China and its regional allies. Southeast Asia’s imperial transition from colonial order to U.S. empire, through the tumult of decolonization and the Cold War, was more characteristic of the region’s history after 1945 than Indochina’s embrace of communism.