What's the rationale for adopting the US dollar as "legal tender" in Argentina?

Adopting the US dollar as "legal tender" in Argentina and in other countries is a specific currency policy that is called "dollarization." This fixed currency policy uses the currency of a foreign country that is believed to be more stable because of previous domestic currency problems such as hyper inflation. The goal is to stabilize the country's economy by substituting another currency for their own currency.