For a more modern example, one of my former employers had to ramp by a couple of orders of magnitude to build ventilators during Covid-19. One of my former coworkers told me the story of having to go to Detroit and build a factory there, and how they were able to go from 10-20 a day to hundreds a day by hard work and know-how.

The point I'm trying to make here is that the will to do this still exists in the US today and I have no doubt that if we as a country decided to enter a world war like WWII we would very quickly ramp. We certainly still have the culture and the resources to do it were we to discover the will.