Halloween has no single founder. Britannica describes it as a blend that developed partially from the pre-Christian Gaelic festival of Samhain but derived largely from the Christian feasts of the dead, with All Saints' Day fixed on November 1 making October 31 All Hallows' Eve. Irish and Scottish immigrants carried the customs to the United States in the 19th century, where costumes, trick-or-treating, and the pumpkin jack-o'-lantern took their modern form in the 20th.
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