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 Square
The May 4th Movement (五四运动, wǔsì yùndòng) was sparked by Article 156 of the Treaty of Versailles which transferred German concessions in Shandong including Qingdao to Japan rather than returning sovereign authority to China. Chinese outrage over this provision ignited mass student demonstrations in Beijing on May 4th, 1919 which resulted in the cultural movement know today as the May Fourth Movement. The May 4th Movement influenced the Chinese delegation not to sign the Treaty of Versailles. China declared the end of its war against Germany in September 1919 and signed a separate treaty in 1921.