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John C. Calhoun - Wikipedia
John C. Calhoun | Biography, Significance, Quotes on Slavery,
John C. Calhoun - Biography, Facts & Significance - HISTORY
John C. Calhoun: The Man Who Started the Civil War - HistoryNet
John C. Calhoun: A Featured Biography - U.S. Senate
John C. Calhoun, History, Significance, Accomplishments, APUSH
John C. Calhoun - Clemson University, South Carolina
John C. Calhoun | American Battlefield Trust
John C. Calhoun | Encyclopedia.com
John C. Calhoun - Statesman, Nullification, Sectionalism