champions in different classifications, which are not uniform from state to state, based upon school enrollments. Some publications and internet sites release nationwide rankings for high school sports based on polls or mathematical formulas which take into account various factors like average margin of victory and strength of schedule. Schools that finish atop these rankings, particularly the USA Today poll, often claim to be national champions, and the press calls them "mythical national champions". National Football League In the earliest days of the National Football League, the NFL championship was determined by a formula and by the votes of the NFL owners. In three instances, 1920, 1921 and 1925, this led to disputed titles. In 1932, two teams tied atop the standings led to a one-game playoff for the championship, which was made permanent the next year. There has been some sort of NFL playoff ever since, and as the league grew, so too did the tournament, which eventually took form as the single-elimination tournament it is today. References College football championships High school football in the United States College men's basketball in the United States College football controversies College basketball controversies in the United States