[mytailorisrich]

Following the Opium Wars and other conflicts in the 19th century China actually lost territory and sovereignty in part of its own territory in the heart of China. Suddenly areas of Beijing are controlled by Europeans, and so are many Treaty Ports" along the coast.

When the Mongols and Manchu conquered the Chinese "Crown" it was more of a change of dynasty and they they effectively became Chinese. Mongolia was part of the Chinese empire until its fall in 1912, for instance.