Football is a category of team sports primarily involving kicking a ball to score. The term's specific meaning varies by region, with 'football' often referring to the most popular form locally. Common types include association football (soccer), Australian rules football, Gaelic football, gridiron football (American/Canadian football), rugby league, and rugby union. These diverse codes share historical roots and core concepts, forming a broader 'football family'.
In 1901, the separate Lancashire and Yorkshire competitions of the NRFU merged, forming the Northern Rugby League.
In 1903, the Ontario Rugby Football Union adopted the Burnside rules, which implemented the line of scrimmage and down-and-distance system from American football.
In May 1904, the Fédération Internationale de Football Association (FIFA) was founded in Paris by associations from seven European countries.
In October 1905, U.S. President Theodore Roosevelt urged football representatives from Harvard, Yale, and Princeton to make drastic changes to reduce injury.
In 1905, there were calls to ban American football in the U.S. due to its violence, leading to a meeting hosted by President Theodore Roosevelt and sweeping rule changes.
In 1906, a rule change was introduced to open up the game and reduce injury: the legal forward pass.
In 1906, rugby league rules diverged significantly from rugby union, with the reduction of the team from 15 to 13 players.
In 1906, the Football Act of 1424, which had prohibited a game known as "football" in Scotland, was finally repealed after falling into disuse.
In 1907, a New Zealand professional rugby team toured Australia and Britain.
In 1921, women were banned from playing at English and Scottish Football League grounds.
In 1929, Canadian football implemented the legal forward pass.
In May 1930, the game of "calcio storico," which had ceased to be played after January 1739, was revived.
In 1930, a text was translated which stated "Throw yourself against him" (Age, objice te illi).
In 1948, the Rugby League International Federation (RLIF) was formed at a meeting in Bordeaux.
In 1966, rugby league officials borrowed the American football concept of downs: a team was allowed to retain possession of the ball for four tackles.
In 1970, the iconic ball with a regular pattern of hexagons and pentagons was first used in the World Cup.
In 1971, the maximum number of tackles in rugby league was increased to six, becoming known as the six tackle rule.
In 1995, rugby union became an "open" game, allowing professional players.