I knew that Labor Day in the US and Canada is in the fall, not May 1st like most of the rest of the world. What I didn't know what that May 1st was chosen to commemorate the Haymarket Affair (/Roit/Massacre) in ... Chicago. The more you know.

I knew that Labor Day in the US and Canada is in the fall, not May 1st like most of the rest of the world. What I didn't know what that May 1st was chosen to commemorate the Haymarket Affair (/Roit/Massacre) in ... Chicago. The more you know.
http://en.wikipedia.org/wiki/Haymarket_affair

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