Traditionally each nation has hosted a single Grand Prix, which carries the name of the country. If a single country hosts multiple Grands Prix in a year they receive different names. In European countries, the second event has often been titled the European Grand Prix, or named after a neighbouring state without a race. The United States has held six separate Grands Prix, including the Indianapolis 500, with the variety of names, some events even named after the host city or even a commercial host venue. Grands Prix are not always held at the same circuit each year and may switch locations due to the suitability of the track or the financial status of the race organisers. The German Grand Prix formerly alternated between the Nürburgring and Hockenheimring circuits, and others such as the American and French races have switched venues throughout their history.