Off the Record: The Private Papers of Harry S. Truman. Columbia: University of Missouri Press. ISBN 978-0-8262-1119-4. Letter to Dean Acheson (unsent), August 26, 1960
Woodworth, Steven E. (2010). Manifest Destinies: America's Westward Expansion and the Road to the Civil War. New York: Albert A. Knopf. ISBN 978-0-307-26524-1.

Further reading[edit]
Bergeron, Paul H. "President Polk and economic legislation."Presidential Studies Quarterly (1985): 782–795. online
Chaffin, Tom. Met His Every Goal? James K. Polk and the Legends of Manifest Destiny (University of Tennessee Press; 2014) 124 pages.
Currie, David P., and Emily E. Kadens. "President Polk on Internal Improvements: The Undelivered Veto."Green Bag 2 (2002): 5+ online.
De Voto, Bernard. The Year of Decision: 1846. Houghton Mifflin, 1943. online
Dusinberre, William. "President Polk and the Politics of Slavery". American Nineteenth Century History 3.1 (2002): 1–16. ISSN 1466-4658. Argues he misrepresented the strength of abolitionism, grossly exaggerated likelihood of slaves' massacring white families and seemed to condone secession.
Goodpasture, Albert V. "The Boyhood of President Polk."Tennessee Historical Magazine 7.1 (1921): 36–50.
Kornblith, Gary J. "Rethinking the Coming of the Civil War: a Counterfactual Exercise". Journal of American History 90.1 (2003): 76–105. ISSN 0021-8723. 