According to the AI, the following South American economies have dollarized, and have been free of central-bank-induced instability since:
See CATO's list of
Seven Myths about Dollarization in Latin America.
For these and other reasons, Milei's policy is to annihilate the Argentinian Central Bank, and allow Argentinians free use of USD as an alternative to their own national currency. Policy wonks talk about nonsense like "currency sovereignty" as if issuing paper money is some kind of legitimate policy tool, rather than economic vandalism. "We have the right to vandalize our own country according to our own policies!" Pure insanity. As Milei noted when asked about why let the Fed implicitly set the inflation rate, his answer is that all central-banking is bad, but there are degrees of bad... the Fed is bad, the IMF is worse, but he called the Argentinian Central Bank "the worst thing in the universe." Which is a pretty accurate description since very few central-banks in the world have been more reckless with printing money out of thin-air, definitely out-stripping the outrageous inflation of the US Fed. Only destroying your economy as fast as America is destroying its own economy, when the previous policy was to destroy your economy as fast as possible, is a relative improvement. By pegging their economy to the dollar, this eliminates a lot of policy objections surrounding the minute details of currency policy.
Ideally, Argentina would encourage its citizens to buy and sell in copper, silver and gold coins, which are the only truly durable currencies of history. But they may have to do this in a covert manner, because countries going off of the paper money system is a primary cause of the disease of being invaded or attacked by the US. What do you think is the single biggest reason that Putin is Global Enemy #1, the most hated man in the West? Because
this is why -- threatening to put one of the world's Top-10 largest economies on the gold-standard is how you make the DC Leviathan see red. So, Milei announcing to the world, "Argentina will now go onto the gold-standard" would be the equivalent of sending a team of Argentinian diplomats to Washington to inform the US that Argentina desperately wants to be invaded and occupied by the US military and is willing to blow up a US building to make sure it happens. In fact, declaring to go on the gold standard would get a swifter and more violent response. Not a smart move. But dollarizing, and simultaneously loosing currency regulations so that precious-metals can be used as money without bringing down the ire of the tax authorities in Argentina, etc. is a much smarter way to achieve the same goal, without giving the psychopathic warmongers in DC a ready-made excuse to invade.