alt Hacker News> Taiwan does not consider Taiwan and mainland China to be separate countries.
This is false. Both the government of Taiwan, and the people here, obviously consider the two countries separate, and neither have made any overtures challenging the sovereignty of the CPC in nearly fifty years. Not to mention the fact that the last government to do so has been overthrown in the 90s (the overthrow of the KMT settler colonial dictatorship).
You will now vaguely refer to the ROC constitution, but I'll preempt that by saying the constitution makes no claims to PRC territory, full stop. And the constitutional reforms in the 90s explicitly recognize PRC sovereignty over its territory - because Taiwanese people aren't the KMT and want nothing to do with the KMT's now 8 decade old fight.
> I'm not sure what the invasion would be, a country invading itself?
I know exactly what it would be: tens of thousands of PLA dead at the order of Xi in service of his old man's ego, and economic disaster for both countries, followed up by the most riotously uncontrolled occupied territory in the PRC. Taiwanese people in living memory bled to overthrow a military dictatorship, you think they won't fight to do so again?
PRC invasion of Taiwan would be imperialism.
There's a distinction between countries and governments. Both sides officially consider themselves to be China, the country, but under different, competing governments. They're the product of a civil war inside China, after all.
The current ruling party of Taiwan would like to change that, but they haven't done so for the obvious reason that the PRC would not accept it (and most Taiwanese people prefer to just leave things as they are).