Not an expert, but PRC claims Taiwan, and interestingly the ROC also claims the mainland? https://en.wikipedia.org/wiki/Taiwan#Political_and_legal_sta...

So it sorta seems like they both agree on 'One China', but not who should be running it.

I do think we need taiwan and TSMC is a big part of it. There is too much cutting edge tech in Taiwan, I think the US would go toe to toe to defend Taiwan if necessary. But we're trying to reduce that dependence by building fabs in the US, so that could change in the next 10 years.