With all due respect. You are confusing Hong Kong and Macau. England colonized Hong Kong after the opium wars. The opium wars started because England and to some extent the US refused to stop selling opium in China so the Chinese government seized and burned the illegal opium. This outraged England and so started the opium wars. The Chinese army was no match for the English army/navy so the weak Chinese emperor basically surrendered and England took control of Hong Kong. England returned Hong Kong in 1997 because they had no leg to stand on. Times changed and it was hard to justify holding onto to a part of a foreign country that they gained through selling opium. Macau on the other hand was a lease by the Portuguese. China was not even a communist country when England colonized Hong Kong.
As for Taiwan. Taiwan was a part of China for around 300 years. They lost Taiwan when Japan invaded it. Remember Japan, the country we went to war with. Taiwan was supposed to be returned to China after the defeat of Japan but by then the communist party took control of China and they did not return Taiwan to China. The party that lost to the communists in China fled to Taiwan and referred to themselves as the Republic of China. Meanwhile the communist party that remained in China referred to themselves as the People’s Republic of China. It is a complicated situation however I’m sure you have heard the US say that we respect the one China policy and until recently the US has never fully recognized the Taiwanese government.
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whats the point with this?
HK was only became a valuable place due to western influence and same with Taiwan. Taiwan's culture is what it is, due to Japanese and western influence. Taiwanese consider themselves Taiwanese not Chinese for a reason and have good ties with Japan, as well as USA. I have never met a Taiwanese person who didnt have a strong sense of NOT being Chinese.
This issue is mainland china... not USA (or England)...
also China is calling many areas as its own, even those areas dont want to be part of China. Thats been going on for as long as written history. There isn't any specific area which is Chinese by any type of right other than what it's able to hold on to (usually by extreme force).
and as far as Taiwan goes, USA will try to keep china off of Taiwan, despite whatever it says to China's face because we don't want China to have control of water past Taiwan. China's power is going to drop quickly in the next ten years regardless, so its bargaining power will drop quickly also.