You do realize why we dropped the Bretton Woods regime at the time, right?
TL/DR: In 1944 the Allies agreed to set up a monetary system to help stabilize post-war economies by pegging the US dollar to the price of gold. In turn, the rest of the world pegged its' respective currencies to the US dollar. Over time, however, the balance began to skew heavily towards the US dollar because the US dollar was the world's reserve currency which gegan to give America an undue advantage over other countries. Eventually, thanks to both that and the growing costs of Vietnam, the U.S. dropped the gold standard.
And your comment is actually wrong because the US dollar is backed by the full faith and credit of the United States government; after all, why do you think so many countries buy US treasury bonds? Because they know, at the end of the day, they'll get their value out of them; heck, China of all countries, holds about 10 percent of the total amount of such bonds in its reserves.
Argentina's problems stemmed from a combination of bad political decisions and economic problems led to its' current issues with inflation and recession; simply changing currencies is a stop-gap. FWIW, I hope Javier Milei can get things turned around w./out the world's globsl elites knifing them at every opportunity.