The rest of the world has to produce and export things of value to create wealth. The US for the most part gave up exporting things of value over the last 30 years. Instead we export dollars and treasuries and essentially play the world's banker.
For example, we can kind of sort of temporarily get away with MMT but that's only because we have the reserve currency and the global system can take up a lot of dollar supply. Try running those same policies with failing treasury auctions and you will have people rioting in the streets as we get a taste of real inflation.