On August 20, 1920, a meeting was held by representatives of the Akron Pros, Canton Bulldogs, Cleveland Indians, and Dayton Triangles at the Jordan and Hupmobile auto showroom in Canton, Ohio.
This meeting resulted in the formation of the American Professional Football Conference (APFC), a group who, according to the Canton Evening Repository, intended 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".

Another meeting was held on September 17, 1920 with representatives from teams from four states: Akron, Canton, Cleveland, and Dayton from Ohio; the Hammond Pros and Muncie Flyers from Indiana; the Rochester Jeffersons from New York; and the Rock Island Independents, Decatur Staleys, and Racine (Chicago) Cardinals from Illinois.
The league was renamed to the American Professional Football Association (APFA).
The league elected Jim Thorpe as its first president, and consisted of 14 teams (the Buffalo All-Americans, Chicago Tigers, Columbus Panhandles, and Detroit Heralds joined the league during the year).
The Massillon Tigers from Massillon, Ohio was also at the September 17 meeting, but did not field a team in 1920.
Only two of these teams, the Decatur Staleys (now the Chicago Bears) and the Chicago Cardinals (now the Arizona Cardinals), remain.

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.
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.
On October 3, 1920, the first full week of league play occurred.

The following season resulted in the Chicago Staleys controversially winning the title over the Buffalo All-Americans.
On June 24, 1922, the APFA changed its name to the National Football League (NFL).

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.
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.
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.

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
On August 20, 1920, a meeting was held by representatives of the Akron Pros, Canton Bulldogs, Cleveland Indians, and Dayton Triangles at the Jordan and Hupmobile auto showroom in Canton, Ohio. This meeting resulted in the formation of the American Professional Football Conference (APFC), a group who, according to the Canton Evening Repository, intended 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".
Another meeting was held on September 17, 1920 with representatives from teams from four states: Akron, Canton, Cleveland, and Dayton from Ohio; the Hammond Pros and Muncie Flyers from Indiana; the Rochester Jeffersons from New York; and the Rock Island Independents, Decatur Staleys, and Racine (Chicago) Cardinals from Illinois. The league was renamed to the American Professional Football Association (APFA). The league elected Jim Thorpe as its first president, and consisted of 14 teams (the Buffalo All-Americans, Chicago Tigers, Columbus Panhandles, and Detroit Heralds joined the league during the year). The Massillon Tigers from Massillon, Ohio was also at the September 17 meeting, but did not field a team in 1920. Only two of these teams, the Decatur Staleys (now the Chicago Bears) and the Chicago Cardinals (now the Arizona Cardinals), remain.
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. 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. On October 3, 1920, the first full week of league play occurred.
The following season resulted in the Chicago Staleys controversially winning the title over the Buffalo All-Americans. On June 24, 1922, the APFA changed its name to the National Football League (NFL).
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. 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. 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.
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
National Football League