Political progress
Marx, Karl. Theses On Feuerbach. Friedrich Engels, c. 1888.
Marx, Karl. The German Ideology, including Theses on Feuerbach, translated by Friedrich Engels. Prometheus, 1998.
Cooke, Sam. "A Change Is Gonna Come." Ain't That Good News. RCA Victor, 1964.
Douglass, Frederick. "West India Emancipation." 3 Aug. 1857, Canandaigua, NY, USA.
Madison, James [published as Publius]. "Federalist No. 51, The Structure of the Government Must Furnish the Proper Checks and Balances Between the Different Departments." New York Packet, 8 Feb. 1788.
Madison, James. "No. 51: How to maintain: make the parts check each other. Also, a federal system divides power further.--Madison (or Hamilton)." The Federalist: A Commentary on the Constitution of the United States, edited by Robert Scigliano. The Modern Library, 2001.
Douglass, Frederick. "The Fugitive Slave Law." National Free Soil Convention. 11 Aug. 1852, Pittsburg, PA, USA.
Douglass, Frederick. "The Fugitive Slave Law." The Essential Douglass: Selected Writings and Speeches. Hackett Publishing Company, 2016.
Dylan, Bob. "The Times They Are a-Changin'." The Times They Are a-Changin'. Columbia Records, 1965.
King, Martin Luther, Jr. “I’ve Been to the Mountaintop.” 3 Apr. 1968, Mason Temple, Memphis, TN, USA.
Arguing for the admission of women to practice law before the U.S. Supreme Court.
Lockwood, Belva. Arguing for the admittance of women to practice law before the U.S. Supreme Court. National Convention of Woman Suffrage Association. 16-17 Jan. 1877, Washington, DC, USA.
Coolidge, Calvin. Speech on the anniversary of the Declaration of Independence. 150th anniversary of the Declaration of Independence. 5 July 1926, Philadelphia, PA, USA.
West, Cornell. "Cornell West's Catastrophic Love." BigThink.com, 6 Nov. 2009.
Kennedy, John F. "Inaugural Address." 20 Jan. 1961, East Portico, US Capitol Building, Washington, DC, USA.
King, Martin Luther, Jr. "Letter from a Birmingham Jail." 16 Apr. 1963.
King, Martin Luther, Jr. "Letter from a Birmingham City Jail (1963)." A Testament of Hope: The Essential Writings and Speeches, edited by James M. Washington. HarperOne, 2003.
Castro, Fidel. Discurso Pronunciado por El Comandante Fidel Castro Ruz, Primer Ministro De Gobierno Revolucionario [Speech on the Second Anniversary of the Triumph of the Revolution]. 2 Jan. 1961, Plaza de la Revolución, Havana, Cuba.
Quoting Martin Luther King, Jr., who likely was paraphrasing a quote by Theodore Parker in 1853.
King, Martin Luther, Jr. "Keep Moving From This Mountain." 25 Feb. 1965, Temple Israel of Hollywood, Los Angeles, CA, USA.
Truth, Sojourner. Address to the First Annual Meeting of the American Equal Rights Association. American Equal Rights Association meeting. 9 May 1867, New York, NY, USA.
Orwell, George. "Politics and the English Language." Horizon, Apr. 1946, vol. 13, issue 76, pp. 252-265.
Orwell, George. "Politics and the English Language." The Collected Essays, Journalism and Letters of George Orwell, vol. 4: In Front of Your Nose 1945-1950, edited by Sonia Orwell and Ian Angus. David R. Godine, 1999, no. 38.
Lincoln, Abraham. "The Perpetuation of Our Political Institutions." 27 Jan. 1838, Young Men's Lyceum of Springfield, IL, USA.
Lincoln, Abraham. "Address to the Young Men's Lyceum of Springfield, Illinois, January 27, 1838." Abraham Lincoln: Speeches and Writings 1832-1858, edited by Don E. Fehrenbacher. Library of America, 1989.
Quoted in The Life of Samuel Johnson, LL.D, by James Boswell
Johnson, Samuel. Quoted in journal entry, written by James Boswell. 26 Oct. 1769.
Johnson, Samuel. Quoted in The Life of Samuel Johnson, written by James Boswell, edited by David Womersley. Penguin Classics, 2008.
Kennedy, John F. Address on the First Anniversary of the Alliance for Progress. 13 Mar. 1977, State Dining Room, The White House, Washington, DC, USA.