The National Football League (NFL) was founded in 1920 as the American Professional Football Association (APFA) with ten teams from four states, all of whom existed in some form as participants of regional leagues in their respective territories. The league took on its current name in 1922. The NFL was the first professional football league to successfully establish a nationwide presence, after several decades of failed attempts. Only two founding members, the Decatur Staleys (now the Chicago Bears) and the Chicago Cardinals (now the Arizona Cardinals), are still in the league. The Green Bay Acme Packers, founded in 1919 (joined the NFL in 1921, now the Green Bay Packers) are the oldest NFL franchise with continuous operation in the same location.