Professional football (gridiron) oldest existing professional football club is the Arizona Cardinals, a current member of the National Football League. The Cardinals organization, which was originally based on Racine Street in Chicago, has operated near-continuously since 1913, but counts an earlier team that played from 1898 to 1906 as part of its history. The Watertown Red & Black is the oldest semi-professional club, tracing its history to 1896. While the practice of professional and semi-pro teams playing college and amateur teams was common in the 1890s, the Amateur Athletic Union began pressuring and threatening college teams with the loss of amateur status if
Hawaii Professional Football League homefield of the top seed. The winners of both games meet in the championship game in early March. For the 2011 inaugural season, all four teams will play a six-game regular season, (two games against each other team; one at home, one on the road) over six weeks, which means no BYE weeks like most other football leagues. There will be two playoff rounds, which includes the championship game in March. There are some notable differences from other football leagues. Hawaii Professional Football League The Hawaii Professional Football League, or HPFL, is a professional-football league based in the U.S. state