Halloween had its origins in the festival of Samhain among the Celts of ancient Britain and Ireland.
In the 7th century AD, Pope Boniface IV established All Saints’ Day, originally on May 13, and in the following century, perhaps in an effort to supplant the pagan holiday with a Christian observance, it was moved to November 1.
When large numbers of immigrants, including the Irish, went to the United States beginning in the mid 19th century, they took their Halloween customs with them, and in the 20th century Halloween became one of the principal U.S. holidays, particularly among children.
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