Despite each receiving FIFA-affiliated status in 1913, both the United States and Canada have lacked a consistent, multi-division soccer system until recently. Consequently, the determination of champions has been problematic at times. The United States did not have a truly national top flight league until the FIFA-sanctioned United Soccer Association and the "outlaw" National Professional Soccer League, which had a network television contract, merged in November 1967 to form the North American Soccer League (NASL). The NASL considered the two pre-merge forerunner leagues as part of its history.
Before 1967, there were several regional and city leagues of various levels of quality. For example, the first and second incarnations of the American Soccer League constituted the premier level of professional soccer in the Northeastern United States, but they and teams from the St. Louis Soccer League would regularly defeat the best the other had to offer. These are only two of the most notable leagues of the regional era, as there were professional and amateur competitions in Chicago, California, the greater Western United States, Ontario, and Western Canada, among several other regions.
While the creation of the NASL in 1968 brought bonafide top-flight competition to the U.S. and Canada, its collapse in 1984 saw a temporary return to the fragmented regional structure. The merger of the Western Soccer League and third iteration of the American Soccer League created a national second division in the U.S. known as the American Professional Soccer League (APSL) in 1990. The APSL later absorbed the Canadian Soccer League, which at the time was an attempt at a wholly first division within Canada.
It was not until the establishment of Major League Soccer (MLS) in 1996 as part of FIFA's agreement to award the United States the 1994 World Cup that there was again a truly national, sanctioned first division in either country. Top Canadian teams resided at the second division until MLS expanded to Canada in 2007.
Given the tumultuous history of professional soccer in the United States and Canada, there is a broad history of champions of various kinds in both countries, both in leagues that comprised both nations and cups that were held in only one. This article takes into account all these competitions to compile an accurate listing of American and Canadian soccer champions with an eye towards maintaining continuity.