Spaniard Pedro de Mendoza founds Buenos Aires, Argentina.

Pedro de Mendoza was a Spanish conquistador, soldier and explorer, and the first adelantado of New Andalusia.

Buenos Aires, controlled by the government of the Autonomous City of Buenos Aires, is the capital and largest city of Argentina. It is located on the southwest of the Río de la Plata. Buenos Aires is classified as an Alpha− global city, according to the GaWC 2024 ranking. The city proper has a population of 3.1 million and its urban area 16.7 million, making it the twentieth largest metropolitan area in the world.