The holiday of Halloween originated from the ancient Celtic festival of Samhain, which marked the end of the harvest season and the beginning of winter. The Celts believed that on this night, the boundary between the living and the dead became blurred, and spirits of the dead would return to the world of the living. Over time, the festival of Samhain evolved into the Christian holidays of All Saints' Day and All Souls' Day, but the traditions and superstitions of the original festival were retained. In the 19th century, the holiday of Halloween was popularized in the United States, where it became associated with trick-or-treating, costumes, and other festive activities.
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