Gridiron football

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Gridiron football ( GRID-eye-ərn) is a family of team sports derived from rugby football (and football, by extension) primarily played in the United States and Canada. American football, which uses 11 players, is the version played in the United States and the best known form of gridiron football worldwide, while Canadian football, which uses 12 players, predominates in Canada. Other derivative versions include arena football, flag football, and amateur games such as touch and street football. Football is played at professional, collegiate, high school, semi-professional, and amateur levels. These sports originated in the 19th century from older games related to modern association football and rugby football, more specifically rugby union. American football and Canadian football developed early, alongside but independently of each other; the root of the game known as "football" originated from an 1874 game between Harvard and McGill Universities, following which the American college adopted...

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