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.
Historiography of the May Revolution
According to those historians, the Spanish revolution against absolutism got mixed with the Peninsular War. Charles IV was seen as an absolutist king, and by standing against his father many Spanish got the wrong understanding that Ferdinand VII sympathized with the new enlighten ideas. Thus, the revolutions made in the Americas in the name of Ferdinand VII (such as the May Revolution, the Chuquisaca Revolution or the one in Chile) would have been seeking to replace the absolutist power with others made under the new ideas. Even if Spain was at war with France, the ideals themselves of the French Revolution (liberty, equality and fraternity) were still respected by those people. However, those revolutions pronounced themselves enemies of Napoleon, but did not face any active French military attack, which promoted instead fights between Spanish armies for keeping the old order of maintaining the new one. This situation would have changed with the final defeat of Napoleon and the return of Ferdinand VII to the throne, as he restored absolutism and persecuted the new libertarian ideas within Spain. For the people in South America, the idea of remaining as part of the Spanish Empire, but with a new relation with the mother country, was no longer a feasible option: the only remaining options at this point would have been a return to absolutism, or independentism.