May Revolution
The May Revolution was not the product of the actions of a single political party with a clear and defined agenda, but a convergence of sectors with varying interests. Thus, there are a number of conflicting perspectives about it, because different authors highlight different aspects. Mitre, for example, referred to "The Representation of the Landowners" (an 1809 economic report by Mariano Moreno) and the role of the merchants to support the view that the May Revolution intended to obtain free trade and economic integration with Europe; right-wing revisionists center around Saavedra and the social customs of the time to describe the revolution under conservative principles; and left-wing revisionists use the example of Moreno, Castelli and the rioters led by French and Beruti to describe it as a radical revolution.
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.