https://www.cnn.com/2023/10/23/business/javier-milei-argentina-dollerization-explainer/index.html
Such a move would effectively disband Argentina’s central bank, handing the reins of monetary policy — that is, the power to set interest rates and print more money — over to the US Federal Reserve. The Fed would continue to set the cost of borrowing based on the needs of the US economy, not Argentina’s.
Milei has argued that surrendering autonomy to Washington is a necessary step to instil discipline into Argentinian policymakers. It would mean Argentina would no longer be able to print money.
at this point if you don't issue your own currency it's kind of a sham to call your country sovereign