Tech 32–0. 1917 saw the rise of another Southern team in Centre of Danville, Kentucky. In 1921 Bo McMillin led Centre upset defending national champion Harvard 6–0 in what is widely considered one of the greatest upsets in college football history. The next year Vanderbilt fought Michigan to a scoreless tie at the inaugural game on Dudley Field, the first stadium in the South made exclusively for college football. Michigan coach Fielding Yost and Vanderbilt coach Dan McGugin were brothers-in-law, and the latter the protege of the former. The game featured the season's two best defenses and included a goal line stand by Vanderbilt to preserve the tie. Its result was "a great surprise to the sporting world." Commodore fans celebrated by throwing some 3,000 seat cushions onto the field. The game features prominently in Vanderbilt's history. That same year, Alabama upset Penn 9–7. Vanderbilt's line coach then was Wallace Wade, who in 1925 coached Alabama to the south's first Rose Bowl victory. This game is commonly referred to as "the game that changed the south." Wade followed up the next season with an undefeated record and Rose Bowl tie. Modernization of intercollegiate American football (1933–1969) In the early 1930s, the college game continued to grow, particularly in the South, bolstered by fierce rivalries such as the "South's Oldest Rivalry", between Virginia and North Carolina and the "Deep South's Oldest Rivalry", between Georgia and Auburn. Although before the mid-1920s most national powers came from the Northeast or the Midwest, the trend changed when several teams from the South and the West Coast achieved national success. Wallace William Wade's 1925 Alabama team won the 1926 Rose Bowl after receiving its first national title and William Alexander's 1928 Georgia Tech team defeated California in the 1929 Rose Bowl. College football quickly became the most popular spectator sport in the South. Several major modern college football conferences rose to prominence during this time period. The Southwest Athletic Conference had been founded in 1915. Consisting mostly of schools from Texas, the conference saw back-to-back national champions with Texas Christian University (TCU) in 1938 and Texas A&M in 1939. The Pacific Coast Conference (PCC), a precursor to the Pac-12 Conference (Pac-12), had its own back-to-back champion in the University of Southern California which was awarded the title in 1931 and 1932. The Southeastern Conference (SEC) formed in 1932 and consisted mostly of schools in the