24 maps that explain the NFL

Origins

The American Professional Football Association officially became the National Football League on June 24, 1922. The league fielded 18 teams during that innaugural season, including three that are still in the league today. The Decatur Staleys (who became the Chicago Bears in 1921) and the Chicago Cardinals (now the Arizona Cardinals) were founding teams. The Green Bay Packers, who joined the APFA in 1921 just before the name change, are the...