In the past, there were a lot of dirt ovals with 1 mile in length, that were used by Stock cars or Champcars, before race tracks with dirt surfaces were removed from the racing calendar in the early 1970s. Lot of these racetracks got the nickname "Fairgrounds", for example Arizona State Fairgrounds, California State Fairgrounds or Michigan State Fairgrounds Speedway. The origin of these racetracks was in harness racing. Mile-length tracks were common there. Also the oldest oval race track, the Milwaukee Mile was originally a race track for horse racing.