When talking about the USD, it isn't a question of if the USD went to zero, but when people stop using it entirely in international trade, and it actually becomes worthless. It is currently on artificial life support, but there isn't any sustainable way to continue that.
The cost of yet another war of U.S. aggression would send the dollar into a final value implosion. Yet if you peek at Gettr.com, war propaganda against China is everywhere. It's not just the Republicans, a few years ago "Madame President" held a public speech in a park, and declared war on both Russia and Iran for no particular reason. Iran is backed by China, perhaps because Iran hasn't started any wars. YouTube has "helpfully" one way or other deleted the video of that talk.
The history of Rome is repeating, unless the Federal Reserve is shut down and replaced with a non-criminal central bank, without private profit interest.
[1] Visualizing the Purchasing Power of the Dollar Over the Last Century https://howmuch.net/articles/rise-and-fall-dollar