The Labor Day was besically to honor workers as part of the American organized labor movement.

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Labor Day celebrated unofficially in late 1800's

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First time New York state introduce a bill to recognizing Labor Day

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But the first time  it was into law  in 1887.

Colorado, Massachusetts, New Jersey and New York is those states who followed the low in 1887.

They celebrate it in September, actually it was first Monday of the month.

All over the world, most of the countries honor workers with a holiday and called May Day.

All Americans celebrated both May Day and Labor Day for the workers.