Directly - nothing.
But what of an opinion would *you* be if you were born in Hong Kong or a) Sinkiang / Urumchi or b) Tibet or c) Taiwan (to a lesser degree) or d) inner Mongolia or e) China itself?
And if besides that, you wanted to have freedom of expression, freedom of information in general. Who would you call for help if you got jailed for critising or expressing your opinion about the government? Or simply for exposing the truth.
How would you feel if other country would invade yours and establish its draconian rule there pretending that rule would be for YOUR OWN︀ good?
What if you went to China, got captured, put in jail and they'd be︁ trying to "remove bad elements from your world view, for *your own good!"? Martin, that︂ would be nice for you, huh?
Go to Urumchi or any other place mentioned above︃ (some - more, other - less of a degree), buy a house there and then︄ you'll learn "what it has to do with the US".