May Revolution
The May Revolution happened from May 18 to 25, 1810, in Buenos Aires. Buenos Aires was the capital of the Viceroyalty of the Río de la Plata. It was a Spanish colony that included roughly the territories of present-day Argentina, Bolivia, Paraguay and Uruguay. The result was the removal of Viceroy Baltasar Hidalgo de Cisneros and the forming of a local government now called the "Primera Junta". In Argentina this is now celebrated as "May Week" ().