Outside the US, May Day is recognized in over 80 countries around the world as a day of international labor solidarity.
The first May Day of this kind was in Chicago in 1886, when organized workers energetically demonstrated on May 1st for the legal establishment of the 8-hour day, along with other proletariat class demands.
Three days later, the demonstration was broken up by police force, in what is known as the Haymarket Affair. There is still a statue in Chicago commemorating this historical event.
The US history of worker militancy needs to be re-learned by its population, and drawn upon. The war against capitalist exploitation needs history (with the invaluable lessons it contains), to guide the working masses fighting spirit.
Workers of the world, unite!!