<P> 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 at 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 mainland China was soon under its control and the ROC fled to the island of Taiwan . The One - China policy advocated by both governments precluded dual representation but , amid the Cold and Korean wars , the United States and its allies opposed the replacement of the ROC at the United Nations , although they were persuaded to pressure the government of the ROC to accept international recognition of Mongolia 's independence in 1961 . The United Kingdom , France , and other American allies individually shifted their recognitions of China to the PRC and Albania brought annual votes to replace the ROC with the PRC , but these were defeated since -- after General Assembly Resolution 1668 -- a change in recognition required a two - thirds vote . </P>
<P> 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 at 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 mainland China was soon under its control and the ROC fled to the island of Taiwan . The One - China policy advocated by both governments precluded dual representation but , amid the Cold and Korean wars , the United States and its allies opposed the replacement of the ROC at the United Nations , although they were persuaded to pressure the government of the ROC to accept international recognition of Mongolia 's independence in 1961 . The United Kingdom , France , and other American allies individually shifted their recognitions of China to the PRC and Albania brought annual votes to replace the ROC with the PRC , but these were defeated since -- after General Assembly Resolution 1668 -- a change in recognition required a two - thirds vote . </P>
when did china become a member of the un
when did china become a member of the un
1945
1945