How the United States lost ally to communism? In brief, the United States sabotaged its ally, the Republic of China, for its enemy, the Chinese Communist Party. During World War II, the ROC was a vital ally, at least in Asia-Pacific, of America under Franklin Delano Roosevelt's Administration, whereas the CCP was recognized as a gang of anti-governmental rebellious bandits affiliated to Comintern. After Empire of Japan's surrender in 1945, Manchuria, Japan's critical source of ...