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Otherwise, the league has grown through expansions into new markets, which has proven tremendously successful: as an example it expanded into [[Dallas]] in 1960 with the [[Dallas Cowboys]] franchise, which is the league's most valuable and among the most valuable of all sports franchises worldwide.  It is also very active in teams relocating to other markets (and sometimes returning, such as the [[Los Angeles Rams|Rams franchise]] moving from Cleveland to Los Angeles, then moving to St. Louis and then returning back to Los Angeles).

Otherwise, the league has grown through expansions into new markets, which has proven tremendously successful: as an example it expanded into [[Dallas]] in 1960 with the [[Dallas Cowboys]] franchise, which is the league's most valuable and among the most valuable of all sports franchises worldwide.  It is also very active in teams relocating to other markets (and sometimes returning, such as the [[Los Angeles Rams|Rams franchise]] moving from Cleveland to Los Angeles, then moving to St. Louis and then returning back to Los Angeles).

Unlike [[Major League Baseball]], the NFL does not have a special exemption from antitrust laws (the [[NBA]] and the [[NHL]] also lack such), and thus it has faced competition from rival leagues.  In addition to the leagues mentioned above, notable rivals included the United States Football League (which, in 2022, is attempting a second iteration), the XFL (notable for its association with the professional wrestling organization WWE; its second iteration ended before a single game was played), the Association of American Football, and an attempted expansion into United States markets by the [[Canadian Football League]] (with its differing rules and field dimensions).

Unlike [[Major League Baseball]], the NFL does not have a special exemption from antitrust laws (the [[NBA]] and the [[NHL]] also lack such), and thus it has faced competition from rival leagues.  In addition to the leagues mentioned above, notable rivals included the World Football League in the 1970's, two separate iterations of the United States Football League, three separate iterations of the XFL (notable for its association with the professional wrestling organization WWE; its second iteration ended before a single game was played), the United Football League (a merger of the USFL and XFL), the Association of American Football, and an attempted expansion into United States markets by the [[Canadian Football League]] (with its differing rules and field dimensions).

==Arrangement and League Play==

==Arrangement and League Play==