The United States' most successful diplomat in the Era of Good Feelings was

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John Quincy Adams was the United States' most successful diplomat in the Era of Good Feelings. During his time as Secretary of State under James Monroe, he negotiated several important international agreements, such as the Adams-Onís Treaty with Spain and the Convention of 1818 with Great Britain. He also helped establish the Monroe Doctrine, which asserted American dominance in the Western Hemisphere.

The United States' Most Successful Diplomat in the Era of Good