central Canada, before spreading into the northern and western United States in the 1930s and across the rest of the United States through the 1940s and early 1950s. Initially it was often found in variant forms, such as "tricks or treats," which was used in the earliest known case, a 1917 report in The Sault Daily Star in Sault Ste. Marie, Ontario: Almost everywhere you went last night, particularly in the early part of the evening, you would meet gangs of youngsters out to celebrate. Some of them would have adopted various forms of "camouflage" such as masks, or would appear in long trousers and big hats or with long skirts. But others again didn't. . . . "Tricks or treats" you could hear the gangs call out, and if the householder passed out the "coin" for the "treats" his establishment would be immune from attack until another gang came along that knew not of or had no part in the agreement. As shown by word sleuth Barry Popik, who also found the first use from 1917, variant forms continued, with "trick or a treat" found in Chatsworth, Ontario in 1921, "treat up or tricks" and "treat or tricks" found in Edmonton, Alberta in 1922, and "treat or trick" in Penhold, Alberta in 1924. The now canonical form of "trick or treat" was first seen in 1917 in Chatsworth, only one day after the Sault Ste. Marie use, but "tricks or treats" was still in use in the 1966 television special, It's the Great Pumpkin, Charlie Brown. The thousands of Halloween postcards produced between the start of the 20th century and the 1920s commonly show children but do not depict trick-or-treating. The editor of a collection of over 3,000 vintage Halloween postcards writes, "There are cards which mention the custom [of trick-or-treating] or show children in costumes at the doors, but as far as we can tell they were printed later than the 1920s and more than likely even the 1930s. Tricksters of various sorts are shown on the early postcards, but not the means of appeasing them". Trick-or-treating does not seem to have become a widespread practice until the 1930s, with the first U.S. appearance of the term in 1932, and the first use in a national publication occurring in 1939. Behavior similar to trick-or-treating was more commonly associated with Thanksgiving from 1870 (shortly after that holiday's formalization) until