1931 college football season

The 1931 college football season saw the USC Trojans win the Knute Rockne Memorial Trophy as national champion under the Dickinson System, as well as the No. 1 position from each of the other three contemporary major selectors (Boand, Dunkel, and Houlgate Systems). Rockne, who had coached Notre Dame to a championship in 1930, had been killed in a plane crash on March 31, 1931. For the first time, the champion under the Dickinson System also played in a postseason game. The 1932 Rose Bowl, promoted as a national championship game between the best teams of East and West, matched USC and Tulane, No. 1 and No. 2 in the Dickinson ratings. USC won, 21–12, and was awarded the Albert Russel Erskine Trophy.

Two years later, historian Parke H. Davis selected Pittsburgh and Purdue (No. 9 and No. 10 in the Dickinson ratings) as "National Champion Foot Ball Teams" for 1931; he was the only NCAA-designated "major selector" to choose either team. Davis’ work has been criticized for having a heavy Eastern bias, with little regard for the South and the West Coast. Pittsburgh claims a 1931 national championship on this basis, while Purdue does not.