Labor Day, celebrated on the first Monday in September, is a United States public holiday honoring the American labor movement. Dedicated to the social and economic achievements of American workers, it is considered the "unofficial end of summer" and the start of the back-to-school season. Canada's Labour Day is also celebrated on the first Monday of September.

Beginning in the late 19th century as the trade union and labor movements grew, the unions proposed that a day be set aside to celebrate labor. In 1887, Oregon was the first state of the United States to make it an official public holiday and by the time it became an official federal holiday in 1894, thirty U.S. states officially celebrated Labor Day. More than 80 countries celebrate International Workers' Day on May 1, the European holiday of May Day.

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