This timely collection of essays examines Sino-American relations during the Second World War, the Chinese Civil War and the opening of the Cold War. Drawing on new sources uncovered in China, Taiwan, the UK and the US, the authors demonstrate how 'grassroots' engagements - not just elite diplomacy - established the trans-Pacific networks that both shaped the postwar order in Asia, and continue to influence Sino-US relations today. In these crucial years, servicemen, scientists, students, businesspeople, activists, bureaucrats and many others travelled between the US and China. In every chapter, this innovative volume's approach uncovers their stories using both Chinese and English language sources. By examining interactions among various Chinese and American actors in the dynamic wartime environment, Uneasy Allies reveals a new perspective on the foundations of American power, the brittle nature of the Sino-American relationship, and the early formation of the institutions that shaped the Cold War Pacific.