Claim: In the 1978 Dutch Grand Prix, United States' Mario Andretti emerged as the champion.
Evidence: The 1978 Dutch Grand Prix was a Formula One motor race held at Zandvoort on 27 August 1978. Pos United_States Mario Andretti 
No American has won a Formula One race since Andretti's victory at the 1978 Dutch Grand Prix. Mario Gabriele Andretti (born February 28, 1940) is an Italian-born American former racing driver and one of the most successful Americans in the history of the sport. Mario Andretti 1968–1972, 1974–1982 1 (1978) 1978 Dutch Grand Prix