Notable Quotable – John Quincy Adams 1820 Tags: 1820, 19th Century Politics, 36°30' Parallel, 6th US President, Abolitionist Origins, American history, Antebellum Era, Balance of Power, constitutional law, Federalism, John Quincy Adams, John Quincy Adams Quote, Legislative History, Missouri Compromise, Missouri Statehood, National Identity, Notable Quotable, Preservation of the Union, Secretary of State, Sectionalism, slavery in America, Share on: Share: View our photo collection! View Collection