Because, between 1927 and 1949, China (then the Republic of China on the mainland) was engaged in civil war, alongside the Second World War. The Nationalists vs. The Communists. The Communists won and established the People's Republic of China (PRC) on the mainland. The Nationalists were forced to move the Republic of China (ROC) to Taiwan. The PRC is now commonly known as "China" and the ROC as "Taiwan". Both sides still officially claim to be the sole legitimate government of all of China, but the ROC was kicked out of the UN and many other international organisations in the 1970s and replaced by the PRC.
the ironclad warship and the two chinas
No it is not.
Use communist Chinas official name in public
Asia
Disputes in the ROC.
Beijing
Confucianism.
Xinjiang
19.33%
Great wall of china
Mao Zedong
Mao Zedong