Hong Kong did not, and by all indications does not, want to be Chinese. Talk to a few Cantonese Chinese in Australia: they especially do not want it. Tibet did not, and by all indications does not, want to be Chinese. Xinjang did not, and by all indications does not, want to be Chinese.

I hate historical claims. There are disputed territories less than 10km from where I live, and if at all possible, I'd like there not to be a war here. I doubt there's many places where that's not the case. I know there's some, but not many.