I think decades is a stretch. Keep in mind most of these chains sprung up in the last 3 decades organically in Taiwan and China (and many of them are still elsewhere-- e.g. BASF is still a titan.)
If it's a national priority, you can get some production going a lot faster than this.
Defeating CoVID was too a national priority. Did they manage to build a single new mask manufacturing line?
No, but they actually tried really hard. Dozens of companies were recruited for the effort, and they just gave up after realising that they can't even get a single part in the blowing machine to be made in the US.
I don't think this is a fair representation of what happened. US capacity existed and some additional came online, but then largely failed because of overseas product still coming in below their cost. Semiconductors after a shooting war with China would be a different picture: an imminent return to normalcy wouldn't be in everyone's economic calculations.
https://www.nytimes.com/2022/03/05/business/dealbook/america...
> that they can't even get a single part in the blowing machine to be made in the US.
Not even a single part? Now you're in hyperbole-land.