In 1905 the AAA established a national driving championship and became the first sanctioning body for auto racing in the United States. The AAA ceased sanctioning auto racing in the general outrage over motor racing safety that followed the 1955 Le Mans disaster. In response, Indianapolis Motor Speedway president Tony Hulman formed the United States Auto Club (USAC) to take over the sanctioning of what was called "championship" auto racing, or open wheel racing, whose biggest event was the annual Indianapolis 500 at the Indianapolis Motor Speedway. USAC sanctioned the championship exclusively until 1978, and was the Fédération Internationale de l'Automobile's recognized American authority with regard to open wheel racing.