TSMC in Taiwan has a significant share of the wafers produced by the world every month. If those wafers were not produced the global economy would suffer badly.

It takes years to bring a fab online. Fab 21 in Arizona took 5 years to enter mass production from ground breaking. Some believe it could be done in two but that’s yet to be demonstrated. Then there are the wafers themselves. The total time it takes to process one wafer at the single nm scale is around 100 days.

So realistically, even if one makes up their mind to make a fab fast, you’re looking at 3 years before you have your first sellable wafer.