In the United States, starting with a 1983 debut race and victory at the 1983 SCCA Runoffs the Swift DB-1 became the dominant chassis in North America Formula Ford racing with ten championships between 1983 and 1996. The DB-6 evolution of the chassis won an additional six championships through 2008. During this time Formula Ford was on the decline in the US for several reasons. The rising cost of competition, SCCA's introduction of a spec sports racer, Sports Renault, and the dominance of the Swift chassis helped to collapse the class in the US.