May Revolution
The mutiny of Aranjuez in 1808 led King Charles IV of Spain to abdicate in favor of his son, Ferdinand VII. Charles IV requested that Napoleon restore him to the throne; instead, Napoleon crowned his own brother, Joseph Bonaparte, as the new Spanish King. These events are known as the Abdications of Bayonne. Joseph's coronation was met with severe resistance in Spain, which started the Peninsular War, and the Supreme Central Junta took power in the name of the absent king. This also led to Spain switching allegiances from France to Britain. France eventually invaded Sevilla, and a Council of Regency based in Cadiz replaced the disbanded Supreme Central Junta.
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.