There are 3 U.S. airlines that fly to Argentina. I flew American from DFW, arriving on 11 November. There were about 5 people on the Customs line for foreigners. Everyone else on the flight was an Argentine. Some announcements on th flight weren't even given in English, a la Japan Airlines
Years ago, the U.S Consulate rejected many Argentines' requests for visas. I would think now , few if any are turned down. Three U.S. airlines fly to Argentina. If vast numbers of Argentines didn't get visas the planes would fly empty and the routes would be cancelled. I wouldn't be surprised if the airlines didn't do something ($$$$$) to influenece the number of visas that are issued.
It's heart warming to see that so many Argentines have so much money to spend to travel to the U.S.