Baltasar Hidalgo de Cisneros
The news of the fall of the Junta of Seville reached Buenos Aires in May 1810. With both the king of Spain and the Junta removed of power, many people thought that Cisneros had no legitimacy to govern, starting the May Revolution. Cisneros tried to calm down the population, to no avail. He called the commanders of the local armies and requested their support, but they denied it. Cisneros was ultimately forced to allow an open cabildo, which would discuss what to do. Although those meetings were usually composed of the wealthiest population, the army and a group of rioters plotted to prevent the entry of many wealthy people and allow common people instead.
May Day riots of 1894
May Day, or International Workers' Day was a day for remembering the workers who died during the Haymarket affair of 1886. During a General Strike in Chicago, Illinois, an unknown person threw a bomb into the crowd, prompting police to fire into the crowd, killing civilians and police alike. The same day in 1890, Raymond Lavigne called for international demonstrations to commemorate the day. In 1894 the Pullman Strike in Illinois, as well as this series of unemployed workers' riots on May Day in Cleveland, prompted U.S. President Grover Cleveland to propose a bill that would make a Labor Day a national public holiday. After the Haymarket Square riot in May, 1886, US President Grover Cleveland 
feared that commemorating Labor Day on May 1 could become an opportunity to commemorate the riots. May Day celebrations have diminished in the United States, because of the creation of Labor Day.