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The Grand Prize was discontinued after the 1916 event.
Between a lack of European participation due to World War I and the growing American interest in oval racing, road racing fell by the wayside.
The two Santa Monica events were the only road races on the 1916 championship, and the aborted 1917 National Championship was slated to feature 8 events, all ovals and 6 of them board tracks.
The Vanderbilt Cup was revived in 1936 and 1937 and run to Grand Prix regulations, but the races were a commercial failure.

1.827 seconds.