Founding and history
On August 20, 1920, a meeting was held by representatives of the Akron Pros, Canton Bulldogs, Cleveland Indians, Rock Island Independents and Dayton Triangles at the Jordan and Hupmobile auto showroom in Canton, Ohio.[8] This meeting resulted in the formation of the American Professional Football Conference (APFC), a group who, according to the Canton Evening Repository, intend… Moreed to "raise the standard of professional football in every way possible, to eliminate bidding for players between rival clubs and to secure cooperation in the formation of schedules".[9] Another meeting held on September 17, 1920 resulted in the renaming of the league to the American Professional Football Association (APFA).[9] The league hired Jim Thorpe as its first president, and consisted of 14 teams. Only two of these teams, the Decatur Staleys (now the Chicago Bears) and the Chicago Cardinals (now the Arizona Cardinals), remain.[10]

The Akron Pros won the first APFA (NFL) Championship.
Although the league did not maintain official standings for its 1920 inaugural season and teams played schedules that included non-league opponents, the APFA awarded the Akron Pros the championship by virtue of their 8–0–3 (8 wins, 0 losses, and 3 ties) record.[11] The first event occurred on September 26, 1920 when the Rock Island Independents defeated the non-league St. Paul Ideals 48–0 at Douglas Park.[8][12] On October 3, 1920, the first full week of league play occurred.[13][14] The following season resulted in the Chicago Staleys controversially winning the title over the Buffalo All-Americans.[15] On June 24, 1922, the APFA changed its name to the National Football League (NFL).[16][17]
In 1932, the season ended with the Chicago Bears (6–1–6) and the Portsmouth Spartans (6–1–4) tied for first in the league standings.[18] At the time, teams were ranked on a single table and the team with the highest winning percentage (not including ties, which were not counted towards the standings) at the end of the season was declared the champion; the only tiebreaker was that in the event of a tie, if two teams played twice in a season, the result of the second game determined the title (the source of the 1921 controversy). This method had been used since the league's creation in 1920, but no situation had been encountered where two teams were tied for first. The league quickly determined that a playoff game between Chicago and Portsmouth was needed to decide the league's champion. The teams were originally scheduled to play the playoff game, officially a regular season game that would count towards the regular season standings, at Wrigley Field in Chicago, but a combination of heavy snow and extreme cold forced the game to be moved indoors to Chicago Stadium, which did not have a regulation-size football field. Playing with altered rules to accommodate the smaller playing field, the Bears won the game 9–0 and thus won the championship. Fan interest in the de facto championship game led the NFL, beginning in 1933, to split into two divisions with a championship game to be played between the division champions.[19] The 1934 season also marked the first of 12 seasons in which African Americans were absent from the league. The de facto ban was rescinded in 1946, following public pressure and coinciding with the removal of a similar ban in Major League Baseball.[20]
The NFL was always the foremost professional football league in the United States; it nevertheless faced a large number of rival professional leagues through the 1930s and 1940s. Rival leagues included at least three separate American Football Leagues and the All-America Football Conference (AAFC), on top of various regional leagues of varying caliber. Three NFL teams trace their histories to these rival leagues, including the Los Angeles Rams (who came from a 1936 iteration of the American Football League), the Cleveland Browns and San Francisco 49ers (the last two of which came from the AAFC). By the 1950s, the NFL had an effective monopoly on professional football in the United States; its only competition in North America was the professional Canadian football circuit, which formally became the Canadian Football League (CFL) in 1958. With Canadian football being a different football code than the American game, the CFL established a niche market Less