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The United States Auto Club (USAC) is a sanctioning body for professional auto racing in the United States. It was founded in 1956 and is known for sanctioning a variety of open-wheel racing series, including midget, sprint car, and Silver Crown cars. USAC also has a significant role in dirt track racing and has been involved in various forms of motorsports throughout its history.
USAC is one of the oldest and most respected sanctioning bodies in American motorsports.