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 Fourth Movement
The May Fourth Movement served as an intellectual turning point in China; it was a seminal event that radicalized Chinese intellectual thought. Western-style liberal democracy had previously had a degree of traction amongst Chinese intellectuals, but after the Versailles Treaty (which was viewed as a betrayal of China's interests), lost much of its attractiveness. Woodrow Wilson's Fourteen Points, despite being rooted in moralism, were also seen as Western-centric and hypocritical.