
May Revolution
The May Revolution was a week-long series of revolutionary events that took place from May 18 to 25, 1810, in Buenos Aires, capital of the Viceroyalty of the Río de la Plata, a colony of the Spanish Crown, which contained the present-day nations of Argentina, Bolivia, Paraguay and Uruguay. These events are commemorated in Argentina as "May Week". The consequences of the events were that the viceroy, Baltasar Hidalgo de Cisneros, was ousted from office and a local government, Primera Junta, was instituted on May 25.
The Primera Junta or First Assembly is the name given by historians to the first government that appeared in Argentina after the May Revolution. The junta operated out of El Fuerte (the fort, modern Casa Rosada), which had been used since 1776 as a residence by the viceroys. Once the junta, which initially only had representatives from Buenos Aires, was expanded with the addition of deputies from the other cities of the former Río de la Plata, it became popularly known as the Junta Grande.