[4] Coolidge turned his attention to financing the rapidly growing industrial economy, with major interests in textiles banking, railroads, publishing and electricity.

Coolidge was involved in numerous civic enterprises Boston area, especially the design of the region's park system.

[3] A Republican, he was appointed by Benjamin Harrison to succeed Whitelaw Reid as United States Ambassador to France on May 12, 1892, a role his great-grandfather had held from May 1785 to September 1789.

[7] Historian Ernest May says Coolidge was, "a prototype member of what today we call the foreign policy establishment.

"[8] Coolidge donated the Grand Army Hall and a public library to the town of Manchester-by-the-Sea, Massachusetts that cost more than $40,000.

[4] In 1898, Coolidge donated a collection of Thomas Jefferson's personal papers to the Massachusetts Historical Society in Boston.

[3] He purchased El Jaleo by John Singer Sargent and gifted it to Isabella Stewart Gardner in 1914.