May 30th in history:
Decoration Day was observed in the U.S. for the first time on May 30th, 1868. It later became known as Memorial Day, and it would be observed on May 30th every year for over a century, until 1971, when it was turned into a Monday holiday.
The Lincoln Memorial in Washington, D.C., was dedicated on Memorial Day of 1922.
Memorial Day of 1911 was chosen as the occasion for a 500-mile car race in Indianapolis. The Indy 500 has continued since then – first on May 30th for many years, and now on the Sunday of Memorial Day weekend.
Daredevil Evel Knievel jumped his vehicle of choice – a motorcycle – over 16 cars at a racetrack in California on May 30th, 1967.