The origin of trick-or-treating may have also come from Celtic tradition. Poor children in Britain and lreland went doo-to-door on All Hallows Eve and received food in exchange for the promise of praying for the giver's dead relatives on All Saints Day. This practice was know as "going-a-souling." While that may be the start of it, that tradition didn't makeits way to America. Here, trick-or-treating may have started with children trading songs for treats in the 1910s, according to old newspaper texts. The tradition didn't really take off until after World War ll, when popular children's magazines started discussing it and the idea entered popular culture, including radio shows and cartoons.