USC claims 11 national titles, although not
all are universally recognized. Since the NCAA does not conduct a
playoff in Division 1-A football, there is no official national
champion. The NCAA does have a list of polls, computer systems and
others that are often used to attempt to determine National Champions.
Because there is no playoff there are often disputes over who really has
won the National Championship. Some years there are undisputed champions
(where one school is ranked number one in all the polls), other years
there are consensus champions (when one school clearly has been ranked
number one in most of the polls) and some years there are split or
shared championships (where two or more schools are ranked number one in
major polls) In the case of USC, few dispute nine of the national
championship it claims to have won. Two of the championships - 1928 and
1939 - have been challenged by some sports historians. In both cases USC
bases its claim on winning the Dickinson System, a formula devised by a
University of Illinois professor which awarded the only championship
trophy between 1926 and 1940. In both these years, Dickinson was the
only poll or system to rank the Trojans number one. USC's stance,
however, is in keeping with that of most other schools which won the
Dickinson title; only Notre Dame, which won the Dickinson crown in 1938,
does not claim a major national title for that year. Since at least
1969, USC had not listed 1939 as a national championship year; but in
2004, USC once again began recognizing the 1939 team as national
champions after it determined that it qualified.
The Trojans have suffered only three losing seasons since 1961 and have
captured 35 Pac-10 titles. This achievement ranks fourth-most among
conference championships of any school, and more than twice as many as
any other Pac-10 member.