Six of the original seven races took place in Europe; the only non-European race that counted towards the World Championship in 1950 was the Indianapolis 500, which was held to different regulations and later replaced by the United States Grand Prix. The F1 championship gradually expanded to other non-European countries. Argentina hosted the first South American Grand Prix in , and Morocco hosted the first African World Championship race in . Asia (Japan in ) and Oceania (Australia in ) followed, and the first race in the Middle East was held in . The nineteen races of the season were spread over every populated continent except for Africa, with ten Grands Prix held outside Europe.