Merrill Monroe Jensen (July 16, 1905 in Elk Horn, Iowa - January 30, 1980 in Madison, Wisconsin) was an American historian, whose research and writing focused on the ratification of the United States Constitution. His historical interpretations are generally considered to be of the "Progressive School" of American history, the most famous exponent of which was Charles A. Beard. Jensen was a professor of history at the University of Washington (1935–1944), where he was editor of Pacific Northwest Quarterly, and the University of Wisconsin–Madison (1944–1976).
Born in Iowa, Jensen took a job as a teacher in a one-room schoolhouse in South Dakota upon graduating from high school. In 1929 he earned a bachelor's degree at the University of Washington. He completed a Ph.D. at the University of Wisconsin–Madison in 1934. Except for a short stint as a historian for the Army Air Corps in 1944, his career was spent at his undergraduate and graduate alma maters. He was appointed Harold Vyvyan Harmsworth Professor of American History at Oxford University in 1949-1950.
He and his wife Genevieve Margaret Privet had one daughter. He died in Madison, Wisconsin, on January 30, 1980.
Jensen viewed the American Revolution was “an internal revolution carried on by the masses of the people against the local aristocracy.” His early scholarship challenged the "consensus" interpretation of the Constitutional ratification process, arguing that the Articles of Confederation were a better expression of genuine democratic values than was the Constitution. The replacement of the Articles with the Constitution, Jensen argued, created a system of government that minimized the influence of radical democracy rooted in local politics.
From his reading of the documentary evidence, Jensen identified deep ideological conflicts among Americans at the time of the ratificaton. His later scholarship focused heavily on primary documents, and he edited a number of substantial document collections, including the The Documentary History of the First Federal Elections, 1788-1790 (launched in 1976 and completed in 1989 by his students Robert A. Becker and Gordon denBoer) and the The Documentary History of the Ratification of the Constitution and the Bill of Rights, 1787-1791, (launched in 1976 and as of 1 January 2010 filling 21 of a projected 31 volumes).
- The Articles of Confederation: An Interpretation of the Social-Constitutional History of the American Revolution, 1774-1781 (University of Wisconsin Press, 1940) read online
- The New Nation: A History of the United States during the Confederation, 1781-1789 (1950) read online
- The Founding of a Nation: A History of the American Revolution, 1763-1776 (Oxford University Press, 1968) online edition
- The American Revolution within America (New York University Press, 1974) read online
- Regionalism in America (1951)
- English Historical Documents, Volume IX, American Colonial Documents to 1776 (1955)
- The Making of the American Constitution (1964)
- Tracts of the American Revolution, 1763-1776 (1967) read online
- The Documentary History of the First Federal Elections, Volume I, 1788-1790 (1976), edited with Robert A. Becker. read online
- The Documentary History of the Ratification of the Constitution, Volume I: Constitutional Documents and Records, 1776-1787 (1976), edited with John P. Kaminski and Gaspare J. Saladino. read online
- The Documentary History of the Ratification of the Constitution, Volume II: Ratification by the States: Pennsylvania (1976), edited with John P. Kaminski and Gaspare J. Saladino.
- David S. Lovejoy, "Merrill Monroe Jensen," Proceedings of the Massachusetts Historical Society, Vol. 92 (1980), pps. 140-143.
- Stephen E. Patterson, "Interested Parties: Merrill Jensen and the Documentary History of Ratification," The William and Mary Quarterly, Vol. 59, No. 3 (July 2002), pps. 776-786
- "Center for the Study of the American Constitution". Retrieved 29 Sep 2014.