The U.S. is providing a $20 billion currency swap line with Argentina’s central bank — essentially exchanging stable U.S. dollars with volatile pesos.
While Argentina poses little systemic risk, it can still matter in terms of flight risk for capital along with volatility in debt and commodity markets.
In addition to economic and market matters, the U.S. has a significant political stake in what’s happening in Argentina
And the Trump regime has a vested interrest in propping up other fascist to “prove” that their economic model (robbing the populace) can work (at least until they are done with their raid)