Is Taiwan a country or just a state of China? If it is a country, then why is its official name ‘Republic of China’?

Officially: There is only one China. China includes mainland China and Taiwan. There are two political entities that claim to be the rightful government of all China (both mainland and Taiwan): they are the People’s Republic of China (PRC), and the Republic of China (ROC). The People’s Republic of China has effective control on mainland China, but also claims sovereignty over Taiwan. The Republic of China has effective control on Taiwan, but also claims sovereignty over mainland China. Taiwan is considered a rebel province by the......