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Why is John Quincy Adams important?

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The Editors of Encyclopaedia Britannica
Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree....
The Editors of Encyclopaedia Britannica

John Quincy Adams was the sixth president of the United States (1825–29). In his prepresidential years he was one of America’s greatest diplomats—formulating, among other things, what came to be called the Monroe Doctrine—and in his postpresidential years (as a U.S. congressman, 1831–48) he fought against the expansion of slavery.