Do Argentines need 6 months validity on their passports to obtain a visa to the US?
This is not a requirement. While visa regulations state that a passport must be valid for at least six months beyond the date of the holder’s departure from the United States, the United States has an agreement with many countries (including Argentina) automatically extending the validity of a passport for six months past the passport’s expiration date. The result is that an Argentine passport should remain valid at least for the duration of the traveler’s stay in the United States.