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Auto racing became popular. Drivers would race an 8.4-mile loop made up of city streets. The "Free-For-All Race" was conducted between 1910 and 1912. The United States Grand Prix was held in Santa Monica in 1914 and 1916, awarding the "American Grand Prize" and the "Vanderbilt Cup" trophies. By 1919, the events were attracting 100,000 people, at which point the city halted them.