For the majority of the national championship, the races have been held inside the United States. American championship cars raced at the Monza oval in 1957 and 1958 alongside Formula One and sports cars in the non-championship Race of Two Worlds. Also, in 1966 there was a non-championship USAC race at Fuji Speedway in Japan. The first championship events outside the U.S. took place in 1967 at Mosport and Saint-Jovite in Canada. In 1971, the USAC season-opening race was held at Rafaela. In the autumn of 1978, two races were held in England, the first at Silverstone, then a week later at Brands Hatch.