On a bright October morning in 1904, thousands of people flocked to Nassau County on rural Long Island to witness the first international motor sports competition in America: the newly created Vanderbilt Cup. By 1906, the number of spectators multiplied to a quarter million and America's place in motor racing history was assured. In 1908, the Vanderbilt Cup was joined by a second international competition, the International Grand Prize, the first grand prix held outside France. By 1913, the Indianapolis 500 would supplant the Vanderbilt Cup and Grand Prize as America's preeminent race,...