A national championship in the highest level of college football in the United States, currently the NCAA Division I Football Bowl Subdivision (FBS), is a designation awarded annually by various organizations to their selection of the best college football team. Division I FBS football is the only National Collegiate Athletic Association (NCAA) sport for which the NCAA does not sanction a yearly championship event. As such, it is sometimes unofficially referred to as a "mythical national championship".
Due to the lack of an official NCAA title, determining the nation's top college football team has often engendered controversy. A championship team is independently declared by multiple individuals and organizations, often referred to as "selectors". These choices are not always unanimous. In 1969 even President of the United States Richard Nixon made a selection by announcing, ahead of the season-ending "game of the century" between No. 1 Texas and No. 2 (AP) Arkansas, that the winner would receive a presidential plaque commemorating them as national champions. Texas went on to win, 15–14.
While the NCAA has never officially endorsed a championship team, it has documented the choices of some selectors in its official NCAA Football Bowl Subdivision Records publication. In addition, various analysts have independently published their own choices for each season. These opinions can often diverge with others as well as individual schools' claims to national titles, which may or may not correlate to the selections published elsewhere. Currently, two of the most widely recognized national champion selectors are the Associated Press (AP), which conducts a poll of sportswriters, and the Coaches Poll, a survey of active members of the American Football Coaches Association (AFCA).
Since 1992, various consortia of major bowl games have aimed to invite the top two teams at the end of the regular season (as determined by internal rankings, or aggregates of the major polls and other statistics) to compete in what is intended to be the de facto national championship game. The current iteration of this practice, the College Football Playoff, selects four teams to participate in national semi-finals hosted by two of six partner bowl games, with their winners advancing to the College Football Playoff National Championship.
History
The concept of a national championship in college football dates to the early years of the sport in the late 19th century. Some of the earliest contemporaneous rankings can be traced to Caspar Whitney in Harper's Weekly, J. Parmly Paret in Outing, Charles Patterson, and New York newspaper The Sun.
Claimed intercollegiate championships were limited to various selections and rankings, as the nature of the developing and increasingly violent full-contact sport made it impossible to schedule a post-season tournament to determine an "official" or undisputed champion. National championships in this era were well understood to be "mythical".
Beyond rankings in newspaper columns, awards and trophies began to be presented to teams. In 1917 members of the 9–0 Georgia Tech squad were given gold footballs with the inscription "National Champions" by alumni at their post-season banquet. The Veteran Athletes of Philadelphia put up the Bonniwell Trophy for the national championship in 1919 under the stipulation that it was only "to be awarded in such years as produces a team whose standing is so preeminent as to make its selection as champion of America beyond dispute." Notre Dame was the first to be awarded the trophy, in 1924.
Professor Frank G. Dickinson of Illinois developed the first mathematical ranking system to be widely popularized. Chicago clothing manufacturer Jack F. Rissman donated a trophy for the system's national championship in 1926 onward, first awarded to Stanford prior to their tie with Alabama in the Rose Bowl. A curious Knute Rockne, then coach of Notre Dame, convinced Dickinson and Rissman to backdate the Rissman Trophy two seasons; thus Notre Dame is engraved on the trophy for 1924 and Dartmouth for 1925. The Rissman Trophy was retired by Notre Dame's three wins in 1924, 1929, and 1930; the Knute Rockne Memorial Trophy was put into competition for 1931 following the untimely death of the legendary coach. The popularity of the Dickinson System kicked off a succession of mathematical rankings carried in newspapers and magazines such as the Houlgate System, Azzi Ratem rankings, Dunkel Power Index, Williamson System, and Litkenhous Ratings.