Powerhouse competitor to the NFL, eventually merged as the AFC, resulting in formation of the Super Bowl.
Indoor football played on a field 4x smaller than the NFL, with rules encouraging fast-paced offensive performance.
Highest level of competition in Canadian football, culminating in the Grey Cup championship game in late November.
Never had more than five teams and played its games in the fall season in non-NFL markets.
Joint venture between the World Wrestling Federation and NBC. Conceived as having fewer rules and encouraging rougher play.
Backed by the NFL to serve as a type of spring league. Also known as the World League of American Football (WLAF).
Attempted to move from a spring to a fall schedule to compete directly with the NFL, effectively ending the league's existence.
Following an NFL players strike, the WFL was founded with the opportunity to provide players with better contracts.
Primarily formed by minor-league teams. Lack of a television contract and poor attendance doomed the league.
One of the NFL's most formidable challengers, attracted many of the best players and introduced innovations to the game.
Created when three new franchises joined with three other teams that were lured away from the APFL
Began as minor-league Midwest Football League before changing aspirations to lure teams from the previously failed AFL.
In its brief history, the league made history by being the first league to introduce "major league" football to the West Coast.
Also known as the Grange League, founded by the sports agent who brought along his star player: future HOFer Red Grange.
Teams were based in Pennsylvania coal mining towns, hence the league name's reference to anthracite coal.
Founded in an auto showroom in Canton, Ohio, known as the American Professional Football Association (APFA) its first 2 seasons.
The league's best team, the Jeffersons, was instrumental in bringing the NYPFL and the Ohio League together to form the NFL.
Informal and loose association of teams that competed for the Ohio Independent Championship (OIC).
Founded by baseball owners in Philadelphia, the 3-team league was comprised of baseball and football stars of the day.
A loose association of American football amateur and pro clubs that operated until the arrival of the Ohio League and NYPFL.