China is one of the charter members of the United Nations and is one of five permanent members of its Security Council. One of the victorious Allies of the Second World War (locally known as the Second Sino-Japanese War), the Republic of China (ROC) joined the UN upon its founding in 1945. The subsequent resumption of the Chinese Civil War led to the establishment of the People's Republic of China (PRC) in 1949. Nearly all of the Chinese mainland was soon under its control and the ROC retreated to the island refuge of Taiwan. The One-China policy advocated by both governments dismantled the solution of dual representation but, amid the Cold War and Korean War, the United States and its allies opposed the replacement of the ROC at the United Nations until 1971, although they were persuaded