The traditions of the Twelve Days of Christmas have been nearly forgotten in the United States. Contributing factors include the popularity of the stories of Charles Dickens in nineteenth-century America, with their emphasis on generous giving; introduction of secular traditions in the 19th and 20th centuries, e. g., the American Santa Claus; and increase in the popularity of secular New Year's Eve parties. Presently, the commercial practice treats the Solemnity of Christmas, 25 December, the first day of Christmas, as the last day of the "Christmas" marketing season, as the numerous "after-Christmas sales" that commence on 26 December demonstrate. The commercial calendar has encouraged an erroneous assumption that the Twelve Days "end" on Christmas Day and must therefore begin on 14 December.