The Chinese monarchy collapsed in 1912 with the 1911 Revolution, when the Republic of China (ROC) replaced the Qing dynasty. China was invaded by the Empire of Japan during World War II. The Civil War resulted in a division of territory in 1949 when the Communist Party (CCP) established the People's Republic of China on the mainland while the Kuomintang-led ROC government retreated to the island of Taiwan. Both claim to be the sole legitimate government of China, although the United Nations has recognized the PRC as the sole representation since 1971. China conducted a series of economic reforms since 1978, and entered into the World Trade Organization in 2001.