We have trillion-dollar companies built on TSMC, and the island additionally serves to keep the Chinese Navy unable to sail at will in the Pacific. And unlike many Asian industries, it's not a matter of American companies offshoring their factories; TSMC is simply better at making semiconductors than anyone else in the world.
There are American foundries, but Global Foundries is run by dishonest retards, Intel is the sick man of the chip industry due to brain drain, institutional sclerosis, and diverting money from R&D to DEI for nearly 10 straight years, and Texas Instruments gave up on being bleeding edge ages ago.
If anything, our lifeline in semiconductors is the fact that East Asian countries don't have any equivalent of the Civil Rights Act or a large, negro population that needs to be pandered to, so they can stay ahead of the tech curve without diversity grifters coming for them.