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Slavery is the great and foul stain upon the North American Union. A dissolution, at least temporary, of the Union, as now constituted, would now be certainly necessary. The Union might then be reorganized on the fundamental principle of emancipation.

"John Quincy Adams and the Politics of Slavery: Selections from the Diary". Book by David Waldstreicher and Matthew Mason, 2016.
Slavery is the great and foul stain upon the North American Union. A dissolution, at least temporary, of the Union, as now constituted, would now be certainly necessary. The Union might then be reorganized on the