NFL (national football league) NCAAF (college football) XFL (X-treme football---banned) AFL (Arena football league) UFL (United Football league) CFL (Canadian Football League) EFL (European Football League)
Everton were the Football League Champions in 1891.
NFL stands for "National Football League," which is the professional football league in the USA. CFL stands for "Canadian Football League," which is the professional football league in Canada.
Sunderland were the Football League Champions in 1902.
Derby County were the Football League Champions in 1972.
Arsenal were the Football League Champions in 1934.
Portsmouth were the Football League Champions in 1949.
XFL - Xtreme Football League XFL - Xtreme Football League
German football league
NFL is an American football abbreviation. "NFL" stands for "National Football League". National because the league is played across the nation; Football because the game played is referred to as "football" (It is known as "football" in America. Many countries refer to it a "soccer".); League because this national game is played with multiple teams in many places at different times, etc. (unapproved definition of "league").
Eastern Indoor Football League was created in 2007.
Liverpool were the Football League Champions in 1990.