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.
May Revolution
According to historian Félix Luna's "Breve historia de los Argentinos" (), one of the most important societal consequences of the May Revolution was the shift in the way the people and its rulers related. Until then, the conception of the common good prevailed: while royal authority was fully respected, if an instruction from the crown of Spain was considered detrimental to the common good of the local population, it was half-met or simply ignored. With the revolution, the concept of common good gave way to that of popular sovereignty, as theorized by Moreno, Castelli and Monteagudo, among others. This idea held that, in the absence of a legitimate authority, the people had the right to appoint their own leaders. Over time, popular sovereignty would give way to the idea of majority rule. This maturation of ideas was gradual, taking many decades to crystallize into stable electoral and political systems, but it was what ultimately led to the adoption of the republican system as the form of government for Argentina. Domingo Faustino Sarmiento stated similar views in his "Facundo", and noted that cities were more receptive to republican ideas, while rural areas were more resistant to them, which led to the surge of caudillos.