May Revolution: Citizens of Buenos Aires expel Viceroy Baltasar Hidalgo de Cisneros during the "May Week", starting the Argentine War of Independence.

The May Revolution was a week-long series of events that took place from 18 to 25 May 1810, in Buenos Aires, capital of the Viceroyalty of the Río de la Plata. This Spanish colony included roughly the territories of present-day Argentina, Bolivia, Paraguay, Uruguay, and parts of Brazil. The result…