Born in New York City, he was the son of Edward Carman Rushmore and Mary Eliza (née Dunn) Rushmore, of Tuxedo Park, New York.
[citation needed] In 1885 Rushmore came to the Black Hills of South Dakota to check the titles to properties for an eastern mining company owned by James Wilson [who?]
The memorial was dedicated by President Calvin Coolidge on August 10, 1927.
Rushmore was a member of the Phi Gamma Delta fraternity and a Freemason.
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