Football

The most successful minor league was the American Football League, which existed from 1960 to 1969. The AFL operated as a minor league from 1960 to 1964 and then signed a five-year, USD $36 million television deal with NBC and competed directly against the NFL. AFL teams signed NFL players to contracts, and their popularity grew to challenge that of the NFL. The two leagues merged in the 1970 season, and all AFL teams joined the NFL. An earlier minor league, the All-America Football Conference, was in play from 1946 to 1949. Two AAFC teams, the Cleveland Browns and the San Francisco 49ers, became members of the NFL.[127]
International play
Players with one of the youth divisions of the Borregos Salvajes football program of the Monterrey Institute of Technology and Higher Education, Mexico City.

Football leagues exist throughout the world, but the game has yet to achieve the international success and popularity of baseball and basketball.[128] NFL Europa, the developmental league of the NFL, operated from 1991 to 1992 and then from 1995 to 2007. At the time of its closure, NFL Europa had five teams based in Germany and one in the Netherlands.[129]

The European Football League (EFL), run by the European Federation of American Football (EFAF), is an annual invitational tournament between the champions or co-champions of competitions run by EFAF members. The league's championship game is the Eurobowl.[130] Other EFAF tournaments include the EFAF Cup, played between the top teams from national leagues in a similar manner to the UEFA Cup,[131] the Atlantic Cup, played between teams from the Atlantic region of Europe,[132] and the Challenge Cup, played between teams from newer federations that are not eligible to play in the EFL or EFAF Cup.[133] The International Federation of American Football (IFAF), an international body of American football federations, runs tournaments such as the IFAF World Championship, which is held every four years since 1999, the IFAF Women's World Championship, the IFAF U-19 World Championship and the Flag Football World Championship. The IFAF also organizes the annual International Bowl game.[134] Football federations are also present in Asia, Oceania, and Pan America, and a total of 64 national football federations exist as of July 2012. At the international level, Canada, Mexico, and Japan are considered to be second-tier, while Austria, Germany, and France would rank among a third tier. All of these countries rank far below the United States, which is dominant at the international level.[135]