Argentina's neighboring states in an alternative-war scenario

What might Argentina do if Britain and Chile were too powerful to attack?

Uruguay is suggested as another possibility, but previous wars and the geography of neighboring states make every option difficult.

If Britain and Chile were too powerful to attack, Uruguay is suggested as another possible target for Argentina in the counterfactual. Previous conflicts make that option unattractive too. Bolivia's mountainous approaches would favor defenders, while the wider comparison includes Brazil and Paraguay as further difficult alternatives. The scenario concerns a leadership seeking national unity through an external war, without identifying an easy opponent.