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
For Britain the change was favorable, as it facilitated trade with the cities of the area without seeing it hampered by the monopoly that Spain maintained over their colonies. However, Britain prioritized the war in Europe against France, allied with the Spanish power sector that had not yet been submitted, and could not appear to support American independentist movements or allow military attention of Spain being divided into two different fronts. Consequently, they pushed for independence demonstrations not being made explicit. This pressure was exerted by Lord Strangford, the British ambassador at the court of Rio de Janeiro, expressing support to the Junta, but conditioned ""...if the behavior is consistent and that Capital retained on behalf of Mr. Dn. Fernando VII and his legitimate successors."" However, the following conflicts between Buenos Aires, Montevideo and Artigas led to internal conflicts in the British front, between Strangford and the Portuguese regent John VI of Portugal.