China withdrew from the Simla Accord of 1914 - Tibet did not. That is an important fact that Chinese posters are either not aware of or choose not to remain silent on.
I believe the Indian claim to Aksai Chin is tenacious and little historical basis exists for that - but the Eastern boundary is on good legal footing as far as India is concerned.
Already well answered by
@Nilgiri above.
What about Mongolia, Vietnam, Cambodia, Thailand - rest of Indo-China, Japan, some of the Central Asian republics etc etc - they also "look like Chinese". Heck, what kind of foolish claim to territory is based on 'looks'?
Stop posting racist and nonsensical posts.
Excellent point. Why doesn't Pakistan show the way by returning KP and other Pashto areas to Afghanistan - since the Durand Line was also never recognised by Afghanistan. Heck, going by our chinese buddy's comment above, they even "look" Afghan.
There is a saying you may or may not have heard: People who live in glass houses should not throw stones. I highly recommend it