Tibet, the great leap forward, among others.
And I'd clarify 'China' to 'the Chinese government'.
A friend of Chinese origin explained to me: when there are two people of Chinese origin in a room who don't intimately know each other, both of them will openly support the People's Republic because neither one can be completely sure that the other is not a mole. So given a group of people of Chinese origin, they all support the People's Republic (CCP). Now imagine if you grew up where all adults behaved like this. Would you need any specific brainwashing to support the People's Republic?
I'm half ethnically Chinese, look mostly Chinese, and don't give a shit what the CCP thinks, because I was born in the U.S, have U.S. citizenship, visited China once with a tour group full of white people from places like Peoria, and have no plans to go back. However, if I were physically in China, I'd be a little more circumspect with my political opinions. This is prudent for white Americans within the boundaries of China as well - while you have some protection because of the CCP not wanting to cause an international incident, you are still in a foreign country thousands of miles from home and subject to its laws or lack thereof.
They call it "China Dream".
I don't know if has not been in the recent past? It's certainly been nightbarish and a dictatorship for quite while.