2 nm and upcoming 1.6 nm are Taiwan only. 3 and 4 nm are mostly made in Taiwan. US production of 4 nm won't be up and running until 2030 assuming no schedule overruns.
TSMC makes 60% of world's semiconductors and 90% of the high-end semiconductors (3 nm and lower).
-- GM, Ford, Chrysler, Dodge, Jeep, Toyota, Tesla, BMW, Mercedes, Audi, etc. use TSCM chips for sensors, cpus, control systems, env. control).
-- Boeing, Airbus, Embraer, Bombardier, etc. use lots of TSMC semiconductors.
-- US military radar, missile guidance, ecm, tanks, ships, drones, satellites, control systems, comms systems, etc. use lots of TSMC chips.
-- Apple, nVidia, AMD, Qualcomm, Android phones, toasters, microwaves, thermostats, medical equipment, etc. use TSMC chips.
If TSMC became unavailable, those products would become mostly unavailable for years.
If Taiwan were attacked by China, I think it likely all of TSMC's semiconductor processing would be destroyed -- by China if it failed taking the island, and by the US if China was taking the island.
This is one reason (among others) why the current administration is using techniques to push TSMC to manufacture in the US and why it was so gigantically stupid to not do this previously.
It is also gigantically stupid for the US not to use a few $billion to solve the EMP-vulnerability problem (which right now is such that we are 100% vulnerable to anyone with a couple nukes launched from container ships to destroy everything electrical in the US -- pumps, cars, trains, airplanes, tractors, motorcycles, electric motors, gasoline motors, diesel motors, water systems, waste systems, transport systems, and thus kill 90+% of US citizens as they run out of water and food starting in about 3 days of the event). But that's another discussion of the incompetence and idiocy of our government.