Contributors to the Cause, issued in March 25, 1975.

Contributors to the Cause was a set of commemorative stamps issued by the United States Postal Service as part of the observance of the United States Bicentennial. The set honored four individuals whose contributions to the American Revolution were not well-known by the general public: Sybil Ludington (defined as a “youthful heroine” on an 8-cent stamp), Salem Poor (defined as a “gallant soldier” on a 10-cent stamp), Haym Salomon (defined as a “financial hero” on a 10-cent stamp) and Peter Francisco (defined as a “fighter extraordinary” on an 18-cent stamp).[1]

The set was issued on March 25, 1975. The back of each stamp included a brief history of each subject’s achievement during the war.[2]