May Revolution
The May Revolution was a direct reaction to Spain's Peninsular War. 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 Spanish 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, and the Council of Regency of Spain and the Indies replaced it. News of these events arrived in Buenos Aires on May 18, brought by British ships.
Causes of the May Revolution
The United States had emancipated themselves from the Kingdom of Great Britain in 1776, which provided a tangible example that led Criollos to believe that revolution and independence from Spain could be realistic aims. In the time between 1775 and 1783 the Thirteen Colonies started the American Revolution, first rejecting the governance of the Parliament of Great Britain, and later the British monarchy itself, and waged the American Revolutionary War against their former rulers. The changes were not only political, but also intellectual and social, combining both a strong government with personal liberties. The text of the Declaration of Independence stated that all men are created equal (and thus become equal before the law), and had unalienable rights to life, liberty and the pursuit of happiness. They had also chosen a republican form of government, instead of keeping a monarchic one. Even more, the fact that Spain aided the colonies in their struggle against Britain weakened the argument that ending allegiance to the mother country could be considered a crime.