 The pressure at rival California was stronger (especially as the school had not been as successful in the Big Game as they had hoped), and in 1915 California returned to football.As reasons for the change, the school cited football rule changes, the overwhelming desire of students and supporters to play football, interest in playing other East Coast and Midwest schools, and a patriotic desire to play an "American" game.California's return to football increased the pressure on Stanford to also change back in order to maintain the rivalry.