Zheng Chenggong's children and grandchildren became independent in Taiwan Province, Chinese mainland and Taiwan Province provinces were separated, and Kangxi sent Shi Lang to recover Taiwan Province province, thus reunifying the two sides.
After the Sino-Japanese War of 1894-1895, Taiwan Province Province was divided into northern Japan, Chinese mainland was separated from Taiwan Province Province, Taiwan Province Province was taken back by the National Government in 1945, and Taiwan Province Province returned to China.
During the period of 1949, the Kuomintang Island in Taiwan Province Province temporarily separated the two sides of the strait, but this time it was not the separation of China's sovereignty, but the separation of administrative power. China is sovereign and unified, so the reunification of the two sides of the strait is not "the return of Taiwan Province Province to the motherland."