Rival Leagues to the National Football League have existed since the 1920s, most of them from the 1920s to 1960s called themselves the American Football League, and since then there has been a variety of names and ideas, such as the World Football League (1974-1975), Spring Leagues (United States Football League, 1983-1985), Indoor Football Leagues (Arena Football League 1986-present, though a Minor League rather than a Major League rival since 2000), Extreme Leagues (XFL 2001), Leagues aimed at the Drinks market (Lingerie / Legends Football Leagues 2004-Present).
Only the American Football League of 1960-1969 has been successful long-term, leading to both the start of the Super Bowl between the AFL Winners and the NFL Winners in 1967 and the eventual merger of the two leagues (They are now the American & National Football Conferences in the NFL – the Super Bowl is still played between the winners of the two Conferences)
Note: Leagues in Bold are sometimes considered Major League Rivals to the NFL.
Note 2: Leagues marked with asterisk (*) are sometimes considered AA.
American Football League Era (1926-1959):
Spring / World Football Leagues Era (1950-present):
Arena / Indoor Football Leagues Era (1986-2019)
AAA World Football Leagues (1970-2019):
Minority Football Leagues (2019-):
AAA Football Leagues (Seasons):
AAA American Football Leagues (Season Overviews):
Arena Football League:
Legends Football League | United States:
Liga Football Americano (Mexico):
Alliance of American Football:
Freedom Football League: