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China, in some ways, is more ethnically and geographically diverse than europe.
If China has the geography to be unified, than Europe from Brittany to Astrakhan has as well.
And if Brittany-to-Astrakhan can be divided, China so can be as well.
China is geographically diverse? Er...not as much as Europe. For all intents and purposes, when I say 'China', I don't mean Northeast China, Mongolia, Xinjiang, or Tibet - I'm talking about China Proper, the origin of the Han people.
Apart from southern China, northern China is relatively flat. This is reflected in terms of dialects, since Mandarin is everywhere in northern China, while dialects like Min and Yue are more common in the south.
The geography itself lends power to northern China, since it's a much more cohesive block, which allows them to conquer the south. Where would this block be in Europe?