evidence: The territory of the People's Republic of China (PRC) has frequently been revised since its formation on 1 October 1949. [...] The Republic of China (ROC) government on Taiwan does not recognize the PRC's territorial changes to the 1947 ROC constitution (although amended in 1991 to include the ROC's free area). [...] - 3 September 1954, The People's Republic of China annexed the Yijiangshan Islands and Dachen Islands from the Republic of China during the First Taiwan Strait Crisis (Battle of Yijiangshan) even as the U.S. Seventh Fleet was patrolling nearby.[4]