A hundred years ago, the British used opium to force the Qing government to cut out hongkong. as we all know, is an unequal treaty
What do you expect from a treaty you make with a winner and a loser? China does the exact same thing and has done it for all its existence and that's just how it works.
Therefore, the Chinese people overthrew the incompetent Qing government, established the current state, and regained Hong Kong.
Barely, Japan and Europe were hugely responsible, alongside with external event (the drop of value of silver killed your economy based on... silver). A population is often overthrowing a government when the said government is already fucked up. As for Hong Kong, it wasn't given to the ENglish without a time limit, this one happened in 1997, and the English prefered to give back the whole colony rather than keeping the part they legally had forever. In other words: China regained nothing.
Do you think the government should not deal with the riots? Then please go and see what those Hong Kong independence elements have done?
For people from "our countries", if a government don't respect the right of its people to protest, but rather retaliate them (because it is what we're told), then it'sobviously wrong and China isn't an exception to that. France and French government has been criticized for its reaction toward the Yellow jackets, so Guatemala and many other countries have been.
As for what people from Hong Kong have done, probably your government is also showing you what they want you to think. In France, what was shown about the yellow jackets was essentially people destroying shoppings and attacking policemen whereas they were mostly poor people protesting in peace who sometimes got flashballed for no reason in the real world. There is no reasons to think that China is actually better than that, because the probability than a high percentage of Hong Konng protester being criminals is actually low.
The Chinese are peace-loving.
Sure, everybody is.
They are frantically tampering with textbooks and vilifying China in the media every day, trying to deny that they have the same roots as the mainland, but are we going to wage war?
And China deny their existence as a country, push for them to be unreconized despite everybody is aware that the CCP has no power there. Probably there is a bunch of propaganda against Taiwan the same as there is against China from them, especially considering how taboo is it to talk about Taiwan with many Chinese people.
They did not accept the vaccine from the mainland and went to get the vaccine from Japan.
What vaccine are you talking about? As far as I know, Japan is vaccinating its population with Pfizer, moderna and astrazeneca like many others, so I doubt that they sell a Japanese made vaccine, but rather unused doses they have bought. As for Taiwan refusing the sinovac, it might be because of its poor effectiveness and/or lack of data compared to the others too...
With a history of 5,000 years in China, the leaders of all generations have unified China as their ambition. Is this wrong?
China hasn't been unified neither showing the desire to unify for a fairly long time, and Hong Kong or Taiwan were certainly not part of China back then, neither was Xinjiang, Tibet, Mandchuri etc... Hong Kong territory became Chinese under the Han dynasty, Taiwan under the Qing dynasty... The simple fact that southerners were Nanmans (a word used to say more or less southern barbarians, in the same sense the greeks used) for quite a long time is speaking for itself.
Do we really abuse Xinjiang people? In fact, Xinjiang people are very wealthy, because our Chinese teacher is a Xinjiang native. He was born in Xinjiang and grew up in Xinjiang.
You said your teacher was born there, but you don't say wether your teacher is a Han or not. The problem reported in the medias, and here as well, doesn't concern the Han but the Uyghurs/muslims.
Do you know how many policies the government provides? Large numbers of people are sent to ethnic minority areas.
To be harsh, we call that an ethnocide. To be nice, we call that a way to assimilate a region faster. As for the many minorities you mentionned, there is a fair amount of them that are either half blood or simply scammer because of the support provided to some minorities it seems. I doubt that someone claiming to be a minority for money is truly a minority.
They can even get extra points for exams.
I personally call that racial discrimination, but it's also a trend in some countries like the US or England.
Regarding the new crown virus, I would like to say whether the United States dare to disclose the data of its Fort Detrick laboratory before making fun of China?
There is no fun made of China, there is huge concern. China hiding what happens in their P4 laboratories isn't something anyone knowing what's a P4 happy about. It's more concerning when you realize how China destroyed the collaboration with France on those P4 despite it was a main point for the construction of the said laboratory, and it's even more concerning when you realize how China was careless about the safety and the manipulation protocole of these P4 laboratories... Most of people don't know this because they aren't working or studying topic regarding biology, even among those who yell at China, but this is really a source of concern and Chineses should be the very first worrying about those laboratories.
So no, it's not "it's done now, move on". It's important to get the informations from there for various reasons.