"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."

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When people speak of ideas that revolutionize society, they do but express the fact that within the old society, the elements of a new one have been created, and that the dissolution of the old ideas keeps even pace with the dissolution of the old conditions of existence.

— Karl Marx