<P> In its inaugural season, Division I had two NCAA - recognized national champions, and they faced each other at year's end in the Sugar Bowl on New Year's Eve . The New Orleans game matched two unbeaten teams, the Alabama Crimson Tide (11 - 0), ranked #1 by AP and UPI, and the Notre Dame Fighting Irish (10--0), ranked #3 by AP and #4 by UPI . </P> <P> While both wire services ranked Alabama #1 at the end of the regular season, the final AP poll was after the bowl games . By agreement with the American Football Coaches' Association, however, UPI bestowed its championship before the postseason bowl games, and Alabama was crowned champion by UPI on December 4 . UPI ranked Notre Dame #4 . One coach had given the Irish a first place vote, compared to 21 for Alabama . (In the next season, the final coaches' poll was after the bowls .) </P> <P> In a game where the lead changed six times, Notre Dame won by a single point, 24--23, to claim the AP national championship . During the 20th century, the NCAA had no playoff for major college football teams that would become Division I-A in 1978 . The NCAA Football Guide, however, did note an "unofficial national champion" based on the top ranked teams in the "wire service" (AP and UPI) polls . The "writers' poll" by Associated Press (AP) was the most popular, followed by the "coaches' poll" by United Press International) (UPI). In 1973, the UPI issued its final poll before the bowls, but the AP Trophy was withheld until the postseason was completed . The AP poll in 1973 consisted of the votes of as many as 63 sportswriters and broadcasters, though not all of them voted in every poll . UPI's voting was made by 34 coaches . Those who cast votes would give their opinion of the ten best teams . Under a point system of 20 points for first place, 19 for second, etc., the "overall" ranking was determined . </P> <Table> <Tr> <Th> School </Th> <Th> 1972 Conference </Th> <Th> 1973 Conference </Th> </Tr> <Tr> <Td> Memphis State Tigers </Td> <Td> Missouri Valley </Td> <Td> Independent </Td> </Tr> <Tr> <Td> Abilene Christian Wildcats </Td> <Td> Southland (I - AA) </Td> <Td> Lone Star (D - II) </Td> </Tr> <Tr> <Td> UC Santa Barbara Gauchos </Td> <Td> PCAA </Td> <Td> Dropped Football </Td> </Tr> </Table>

Who won the 1973 college football national championship