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- Charles Sumner's The anti-slavery enterprise, 1855
- Charles Sumner (1811-1874) was a United States senator from Massachusetts and a campaigner against slavery. This is a draft, ca. 1855, of a version of the speech delivered in New York on May 9, 1855, and published that year under the title "The anti-slavery enterprise." Internal evidence indicates that it was to be delivered to a Boston audience, probably on May 15, 1855.