Well, the entire rest of the industrialized world was bombed to shit and the US was not only untouched but also had been ramping up production as much as possib

Well, the entire rest of the industrialized world was bombed to shit and the US was not only untouched but also had been ramping up production as much as possible for 5 years. It's pretty much an ideal situation for a large economy when all of your competitors have destroyed each other and now everyone has to look to buy their rebuilding supplies from you.