World Cup champs of 1978, 1986 and 2022: Abbr.

ARG

This South American country is also famous for its tango music and shares Iguazu Falls with Brazil.

This clue asks for the abbreviated name of the country that won the FIFA World Cup in 1978, 1986, and most recently in 2022. "Abbr." signals that the answer is a short form, so instead of "Argentina," you use "ARG," the three-letter country code commonly seen in sports. The years narrow it down to one team, and soccer fans would recognize Argentina’s iconic wins, especially with legends like Maradona in '86 and Messi in '22.