the USD is essentially a tribute system the Chinese did back in the days.
Trade settle in USD. One problem for other nations, they don't use USD. So other nations like SA/China/ Ger/Jpn will buy USD backed bond (fed), to get some interest. Fed then print money like a mad man, and the money goes back to US company, because wealth fare cheques will be spent buying cheap chinese goods in walmart... etc
Walmart buy more cheap chinese goods, cycle repeats
It was a great setup. I don’t know why Trump got mad and overturned it. Technically the US benefited from it.