Historically Tibet, East Turkistan ( Chinese call it Xing Kiang), Manchuria, Inner Mongolia and Taiwan were never parts of China. China was called Middle Kingdom, because it was only the central part of what is the Chinese Empire was China historically. All other areas were occupied by either the Communist Chgina or Kuomingtang China ( in the case of Taiwan or Formosa). This is true history. China is an imperialist country.