Comparison of rugby league and rugby union 1 in league. A penalty goal is worth 3 points in union and 2 points in league. Use of a penalty box (or "sin bin") was introduced by rugby league in 1980. Rugby union had been experimenting with the same concept since 1979, although it was not formally sanctioned until 2001. Video referee technology was first used for rugby league in 1996 and for rugby union in 2001. In rugby league the ball may be thrown or knocked out of play deliberately, while in union those are penalty offences. Kicking the ball out of play is legal in both codes.
History of rugby union in the United States goal from mark. The scoring systems have evolved in parallel, with both rugby union and American football offering three points for a kicked goal and seven points for a ball run into the end zone and a successfully kicked conversion. One factor aiding in rugby's growth in the early 1900s was American football's crisis of 1905–06, with President Teddy Roosevelt engaging in a debate about the future of American football in response to the perception that American football was a violent sport. The growth of rugby in the United States and particularly in California was aided by the 1905 New