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The 1st of May, or first Monday in May, is a national public holiday in many countries, in most cases as "International Workers' Day" or a similar name. Some countries celebrate a Labour Day on other dates significant to them, such as the United States and Canada, which celebrate Labor Day on the first Monday of September.

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Countries and dependencies coloured by observance of International Workers' Day or a different variant of May Day or Labour Day:

RED = Labour Day falls or may fall on 1 May

YELLOW = Another public holiday on 1 May or the first Monday in May

GREEN = No public holiday on 1 May, but Labour Day on a different date

GREY = No public holiday on 1 May and no Labour Day

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How Labor Day Has Become Such An Important Holiday