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In page Political status of Taiwan:

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In 1949, Mao Zedong's forces defeated Chiang Kai-shek's ROC forces in the Chinese Civil War, thus taking control of mainland China and founding the People's Republic of China (PRC). Chiang Kai-shek and his Kuomintang government fled to Taiwan, which was still under ROC control (as the CCP did not have a navy at that time). Tensions often soared in the following decades. The PRC shelled offshore islands held by Taiwan in the 1950s, and the ROC for many years harbored ambitions of recovering the mainland from the CCP.[4] Throughout the 1950s and 1960s, the United Nations and most non-Communist nations still recognized the ROC as the sole government of China. Non-Communist nations referred to the CCP-controlled mainland as "Red China" during this time.[citation needed]