We have no idea what a major economy like the current US would look like if it went on a real war footing. According to this [34] we spent 40% of GDP on WWII (equivalent of $5 trillion today) - that would be almost $10 trillion a year now if we did the equivalent. That's absolutely insane numbers, and many, many things would change, and quite quickly.

[34] https://www.stlouisfed.org/on-the-economy/2020/february/war-...