First Indianapolis 500 car race, Ray Harroun wins at 74.59 MPH (120 KPH) 

National Conference on the Negro is held 

Reuben Siegel laid cornerstone of 1st home in Tel-Aviv 

First federal workmens compensation law approved 

Aldrich Vineland Currency Act forerunner to Federal Reserve System 

Paris advocate E Archdeacon is 1st passenger in a airplane 

US Assay Office in Salt Lake City, Utah authorized 

Hall of Fame for Great American on NYU campus dedicated 

Memorial Day 1st observed in US 

Eugène Charles Catalan, Belgian mathematician who published extensively on continued fractions and number theory, is born