Recall, it takes years to build these fabs. Fortunately, people will be more likely to spend years in grad school training for these jobs, if they know that when they graduate there will be fabs to hire them.
Rebuilding is a chicken and egg problem, but it’s not as hard as defeating the axis powers in WWII. If this country has the Will to do something, it’s gunna get done.
This is harder than defeating an enemy militarily. Defeating someone militarily is relatively simple to do; and every country figures it out from necessity. It is an expensive process, but ultimately mainly about deciding that the high price is worth it (and if the country can afford it/has the industrial base to sustain the effort, but neither of those things can be changed in a conflict).
Building a profitable industrial chain is significantly harder to do and much rarer to achieve. The US certainly has the people to do it, but it isn't clear that the political trade-offs will be acceptable.
Also remember that the US was at the top of its industrial power during second WW. This time has passed long since. Nowadays it would have a hard time outproducing China and Russia, so I don't think that even a world war would be a solution (not considering the fact that a new WW could be the end of the world itself).
Rebuilding is a chicken and egg problem, but it’s not as hard as defeating the axis powers in WWII. If this country has the Will to do something, it’s gunna get done.