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China has been a largely continuous political entity for about 8,000 years. It's been invaded at least in part a few times (Mongols, 13th c., English, 18th c., and Japanese, 20th c., most especially), but retained its overall identity and either assimilated (Mongols) or repelled (English, Japanese) the invaders, eventually. Contrast Europe which has seen vast shifts in control, and utter replacements or eradication of local culture or tribes multiple times, going to prehistoric times, to the present (past century certainly, past few decades quite arguably). There have been very few constant borders or identities, certainly not on the scale of China. Even written language in China is still largely intelligible to moderns, from a thousand years ago or more. English, more than about 400 years ago is almost wholly foreign: Hwæt,ic swefna cyst secgan wylle, hwæt me gemætte to midre nihte siþþan reordberend reste wunedon. ("Behold, I wish to tell the best of dreams which I dreamt at the middle of the night, after speakers remained in rest." https://www.arts.gla.ac.uk/stella/readings/OE/ROOD.HTM) |
Watch that graphic to see the evolution of the extent of "China" since the Zhou Dynasty in 1000 BC. It occupies a fraction of the current extent of China. So there were lots of wars, and lots of revolutions before modern Chinese borders were established.
I get that Chinese have had more cultural and language cohesion, but that's at least partially because certain dynasties and regions won over these other regions in large swaths and history is written by the winners.