Indianapolis 500 between 1930 and 1936, when it was replaced by the Borg-Warner Trophy. The race was included in the World Championship from 1950 through 1960. Sebring (1959) and Riverside (1958, 1960) In 1957, Riverside International Raceway opened in Riverside, California, about east of Los Angeles. One of its first events was an SCCA National sports car race. For 1958, the race moved to the new, professional USAC Road Racing Championship, and was billed as the "United States Grand Prix". The race attracted over 50 cars and drivers from sports car series in the US and Europe, as well as USAC and NASCAR. Chuck Daigh won in a Scarab, beating Dan Gurney's Ferrari in second place. Russian-born Alec Ulmann staged the first 12 Hours of Sebring endurance race in 1952 at the airport (converted from World War II use) of the rather isolated central Florida town of Sebring, located 1-1/2 hours south of Orlando and Tampa, and 3 hours north of Miami. The track was formed using service roads and runways of Sebring's airport, and it became a round of the World Sportscar Championship in 1953. Buoyed by the success of the 12 Hours, the Riverside sports car race and Formula Libre events at Watkins Glen and Lime Rock Park, Ulmann decided to stage a Formula One race at Sebring International Raceway in 1959. The race was billed as the "II United States Grand Prix", cementing the Riverside race as a part of the Grand Prix's heritage. The race was originally scheduled for March 22, the day after the 12 Hour-race, but rescheduled for December 12, the final round of the season. The race took place 3 months after the previous round at Monza. The starting grid included seven American drivers, but New Zealand's Bruce McLaren, in a Cooper, took his first win in F1 and was, at the time, the youngest driver ever to win a Grand Prix. McLaren took the lead on the last lap of the race when his team-mate, Jack Brabham, ran out of fuel. Brabham had to push his car over the line to finish fourth. By virtue of Ferrari's Tony Brooks finishing third, Brabham and Cooper took the Drivers' and Constructors' championships, respectively. Despite providing an exciting climax to the season, the race was not successful from the hosts' standpoint, the race's isolated location did not help the event's success as the promoters barely