Today many Americans see Labor Day as time off from work, an opportunity to enjoy a barbecue with friends and family and a final moment of summertime relaxation before the busy fall season begins.

But the history behind the Labor Day holiday is far more complex and dramatic than most might realize, starting with a heated campaign by workers in the late 19th century to win support and recognition for their contributions. In July 1894, President Grover Cleveland finally signed into law legislation creating a national Labor Day holiday in early September—even as federal troops in Chicago brutally crushed a strike by railroad and Pullman sleeping car company workers, leaving some 30 people dead.

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