Globalisation of Association football

The need for a single body to oversee Association football had become apparent by the beginning of the 20th century, with the increasing popularity of international fixtures. The English Football Association had chaired many discussions on setting up an international body, but was perceived as making no progress. It fell to associations from seven other European countries: France, Belgium, Denmark, Netherlands, Spain, Sweden, and Switzerland, to form an international association. The Fédération Internationale de Football Association (FIFA) was founded in Paris on May 21, 1904. Its first president was Robert Guérin. The French name and acronym has remained, even outside French-speaking countries.

Reform of American football

Both forms of rugby and American football were noted at the time for serious injuries, as well as the deaths of a significant number of players. By the early 20th century in the USA, this had resulted in national controversy and American football was banned by a number of colleges. Consequently, a series of meetings was held by 19 colleges in 1905–06. This occurred reputedly at the behest of President Theodore Roosevelt. He was considered a fancier of the game, but he threatened to ban it unless the rules were modified to reduce the numbers of deaths and disabilities. The meetings are now considered to be the origin of the National Collegiate Athletic Association.

One proposed change was a widening of the playing field. However, Harvard University had just built a concrete stadium and therefore objected to widening, instead proposing legalisation of the forward pass. The report of the meetings introduced many restrictions on tackling and two more divergences from rugby: the forward pass and the banning of mass formation plays. The changes did not immediately have the desired effect, and 33 American football players were killed during 1908 alone. However, the number of deaths and injuries did gradually decline.

Further divergence of the two rugby codes

Rugby league rules diverged significantly from rugby union in 1906, with the reduction of the team from 15 to 13 players. In 1907, a New Zealand professional rugby team toured Australia and Britain, receiving an enthusiastic response, and professional rugby leagues were launched in Australia the following year. However, the rules of professional games varied from one country to another, and negotiations between various national bodies were required to fix the exact rules for each international match. This situation endured until 1948, when at the instigation of the French league, the Rugby League International Federation (RLIF) was formed at a meeting in Bordeaux.

During the second half of 20th century, the rules changed further. In 1966, rugby league officials borrowed the American football concept of downs: a team could retain possession of the ball for no more than four tackles. The maximum number of tackles was later increased to six (in 1971), and in rugby league this became known as the six tackle rule.

With the advent of full-time professionals in the early 1990s, and the consequent speeding up of the game, the five metre off-side distance between the two teams became 10 metres, and the replacement rule was superseded by various interchange rules, among other changes.

The laws of rugby union also changed significantly during the 20th century. In particular, goals from marks were abolished, kicks directly into touch from outside the 22 metre line were penalised, new laws were put in place to determine who had possession following an inconclusive ruck or maul, and the lifting of players in line-outs was legalised.

In 1995, rugby union became an "open" game, that is one which allowed professional players. Although the original dispute between the two codes has now disappeared — and despite the fact that officials from both forms of rugby football have sometimes mentioned the possibility of re-unification — the rules of both codes and their culture have diverged to such an extent that such an event is unlikely in the foreseeable future.