In what country is Buenos Aires the capital?

Explanation

Buenos Aires is the capital of Argentina. The city is located on Rio de la Plata's southern shore. With its 13 million inhabitants, the city is Argentina's largest metropolitan area. The city's central area makes up its own federal district. The city was founded in 1536 by the Spaniard Pedro de Mendoza and was given the name Nuestra Senora Santa María del Buen Aire (literally 'City of Our Lady Saint Mary of the Fair Winds').