sporadically. The original teams were Duquesne Ironmen (Pennsylvania), Melvindale Redskins (Michigan), Toledo Tornadoes, Dayton Triangles (Ohio) and Newark Rams (New Jersey). Players were from both pro and college teams. Teams also end up play in Sarnia, Zaneville (Ohio Colts), Port Huron and Detroit, while Toledo Tornadoes leave for the larger United Football League (1961–1964). United Football League, 1961–1964 Central States Football League, 1962–1975 Atlantic Coast Football League, 1962–1971, 1973 Midwest Football League, 1962–1978 Southern Football League, 1963–1965 North Pacific Football League, 1963–1966 New England Football League, 1964–1967 Renamed North Atlantic Football League in 1967 Continental Football League, 1965–1969 North American Football League, 1965–1966 Professional Football League of America, 1965–1967 Texas Football League 1966–1968 United American Football League, 1967 South Carolina Football League, 1967 Trans-American Football League, 1970–1971 Midwest Professional Football League, 1970–1972 Seaboard Football League, 1971–1974 Southwestern Football League, 1972–1973 California Football League (1974–1982)California Football League, 1974–1982 American Football Association, 1978–1983 International Football League, 1984 (never played) World League of American Football 1991–1992/NFL Europe 1995–2007 Professional Spring Football League, 1992 Fan Ownership League, 1996 (never played) Regional Football League, 1999 International Football Federation, 2000 (never played) Spring Football League, 2000 XFL, 2001 World Football League, 2008–2010 United Football League, 2009–2012 Hawaii Professional Football League, 2011 (never played) Stars Football League, 2011–2013 North American Football League, 2014 (never played) Fall Experimental Football League, 2014–2015 The Spring League, 2017–2021 Trinity Professional Spring Football League, 2018 (never played) Your Call Football, 2018–2019 Alliance of American Football, 2019 Fútbol Americano de México (FAM), 2019–2022 1: Three teams merged into the NFL 2: Agreed to merger with the NFL in 1966, with merger completed in 1970 3: American Association suspended operations for duration of U.S. involvement in World War II; in 1946 the AA was renamed American Football League 4: Known as the American Professional Football Association in 1938; renamed American Football League in 1939; dissolution after 1939 season caused by formation of 1940–1941 AFL major league 5: Merged with PCPFL in 1945 6: Informal association of teams 7: Merged to form the CFL in 1958 Indoor leagues World Series of Football, 1902–03 Arena Football League, 1987–2008, 2010–2019, 2024– Professional Indoor Football League, 1998–2000 (Bought out by Af2 in 2001) Indoor Football League, 1999–2000 (Bought out by Af2 in 2001;not related to the Indoor Football League that began play in 2009) Indoor Professional Football League, 1999–2001 Arenafootball2 (af2), 2000–2009 (assets acquired in the same transaction