Isn't USA in the process of basically relocating TSMC to Arizona for that reason? And it's not for iPhones. It's because USA military can't risk having the chip supply cut off in wartime.
That's a big no. What's actually happening is that TSMC is building a new factory in Arizona, including training a brand new US workforce. It remains to be seen whether it can even be done. Toyota famously failed with a similar attempt in Fremont, California.
It's a question of whether TSMC is successful because of some sort of strategy that is compatible with American work culture, or do the actual Taiwanese workers play a significant part in their success? Unanswered thus far.
TSMC isn't moving their cutting edge production here. The fabs will be a node or two behind.