Why is John Quincy Adams Not Well Known?

Just published: John Quincy Adams by Harlow Giles Unger.

The author spoke to Britannica: “One reason is that John Quincy Adams may have been the most modest American president in history, even having refused to campaign for election in 1824 and 1828. He believed it was beneath the dignity of a presidential candidate to campaign — to make speeches containing promises he would never be able to keep.”