The inability to make SOTA silicon chips domestically would be catastrophic in a event of a war in the east.

TSMC is making fabs in the US, but they are not SOTA fabs. Those are kept in Taiwan.

Texas Instruments would like to say hi. You don't need SOTA chips for weapons, but exotic capabilities to process data and interact with the radio and infared world.

Isn't building a TSMC factory in US a violation of a "don't build your home on someone's else land" principle? US will be able to shut down or even nationalize the factory, full of expensive equipment, at any moment. It's like lending a goose with golden eggs to your neighbour.

A lot of the more complicated equipment in TSMC fabs (e.g. EUV equipment) is from Europe.

Building a fab is no mean feat and loss of infra is a major blow, but it's certainly not impossible to build these fabs in the West, just not economical. You are not starting from scratch.