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USAC was formed by Indianapolis Motor Speedway owner Tony Hulman when the American Automobile Association (AAA) withdrew from auto racing following the 1955 Le Mans disaster. USAC became the arbiter of rules, car design, and other matters for what it termed Championship automobile racing. This term, which sounds rather generic, in fact became a term of art describing a car built to be used in the highest level of USAC racing. For a while there was a separate series of specifications for Championship cars designed to be run on dirt, rather than paved, tracks.
USAC also became the sanctioning body for many lower levels of motor racing, including sports cars, sprint cars, midget cars, and others.
THE MIGHTY ROAR OF MIDGET auto racing echoing through Wisconsin has been a tradition since 1934. Operating within the state since 1936, the Badger Midget Auto Racing Association (BMARA) and its members, past and present, have played an important role in the development of midget auto racing nationwide.