The May Revolution (Spanish: Revolución de Mayo) was a week-long series of events that took place from May 18 to 25, 1810, in Buenos Aires, capital of the Viceroyalty of the Río de la Plata, a Spanish colony that included roughly the territories of present-day Argentina, Bolivia, Paraguay, and Uruguay. The result was the ousting of Viceroy Baltasar Hidalgo de Cisneros and the establishment of a local government, the Primera Junta (First Junta), on May 25. These events are commemorated in Argentina as "May Week" (Spanish: Semana de Mayo).
The May Revolution was a direct reaction to Spain's Peninsular War of the previous two years. In 1808 King Ferdinand VII of Spain, abdicated in favor of Napoleon, who granted the throne to his brother, Joseph Bonaparte. A Supreme Central Junta led resistance to Joseph's government and the French occupation of Spain, but eventually suffered a series of reversals that resulted in the loss of the northern half of the country. On February 1, 1810, French troops took Seville and gained control of most of Andalusia. The Supreme Junta retreated to Cadiz and dissolved itself, being replaced by the Council of Regency of Spain and the Indies. News of these events arrived in Buenos Aires on May 18, when British ships brought newspapers from Spain and the rest of Europe. (Full article...)