On December 28 1905
Dec. 28, 1905: A second football reform conference involving 62 football-playing schools is held, resulting in the formation of the Intercollegiate Athletic Association of the United States, the precursor to the NCAA.
Sources:
Sources: “In the Arena: The NCAA’s First Century” by Joseph N. Crowley, NCAA News and Champion magazine archives, the NCAA Media Center, and NCAA record books