Sorry, this is off-topic:
Modern China (The "Republic of China" [ROC] founded in 1911 by Sun Yat-sen) did not claim Taiwan as part of its territory in the 1925 draft of its constitution, nor did they do so in 1947 when the ROC constitution was promulgated. It couldn't because the predecessor of the ROC-China, the Qing Dynasty, had given Taiwan away "in perpetuity and full sovereignty" to Japan in 1895. When the ROC overthrew the Qing dynasty in 1911, Taiwan was under the jurisdiction of Japan. How could the PRC-China (The "People's Republic of China," founded under Mao Zedong), which evicted and replaced the ROC in China in 1949 (and which was eventually recognized as representing China by other countries since 1971) claim Taiwan, a territory that it has never governed?
On the other hand, China through the UN has managed to influence the ISO country names standards to cite 'Taiwan, Province of China.' Now there's the real China knock off deal.