The 35th International 500-Mile Sweepstakes was held at the Indianapolis Motor Speedway on Wednesday, May 30, 1951. The event was part of the 1951 AAA National Championship Trail, and was also race 2 of 8 in the 1951 World Championship of Drivers. For the second year in a row, no European Formula One-based teams entered the race.

The 36th International 500-Mile Sweepstakes was a motor race held at the Indianapolis Motor Speedway on Friday, May 30, 1952. It was the opening race of the 1952 AAA National Championship Trail and was also race 2 of 8 in the 1952 World Championship of Drivers.