John England Ross (February 18, 1818 – February 17, 1890) was an American politician born in Madison County, Ohio.
 He led volunteer forces from Oregon in the Cayuse War and the Modoc War, prospected for gold in the California Gold Rush, and represented Josephine County, Oregon in the Oregon Territorial Legislature.
William Jennings Bryan, a prominent American politician in the 1890s, made a speech during his political career that warned against the harms and hubris of American imperialism.
 This speech was made in the context of the Spanish–American War in Cuba and in the Philippines and the aftermath.
 Bryan delivered his famous speech in Indianapolis, Indiana on August 8, 1900; it was entitled "Imperialism: Flag of an Empire."
 This was the speech that is most commented on and the only speech whose main subject was imperialism from Bryan that has been transcribed.
 Bryan calls for a rejection of imperialism in American policy on the grounds that imperialism is directly opposed to basic American values.
 He makes several references throughout the speech calling upon the ideals of democracy and basic human rights.
Mark Robert Killenbeck (born September 29, 1948 in Rochester, New York) is a prominent American legal scholar and historian who is currently the Wylie H. Davis Distinguished Professor of Law at the University of Arkansas School of Law.
 He earned a Bachelors in English literature from Boston College, and a JD and a Ph. D. at the University of Nebraska–Lincoln.
 After teaching literature for a stint at the University of Kansas, Killenbeck worked for thirteen years in central administrative positions for the University of Nebraska System.
 In 1988 he accepted a teaching position in law at the University of Nebraska.
 He was later made Distinguished Professor at the University of Arkansas in 1999.
 He is the author of two books and numerous articles, some of which have been published in such journals as the "Supreme Court Review", the "California Law Review", and the "Michigan Law Review".
James Kerr Kelly (February 16, 1819September 15, 1903) was an American politician born in Pennsylvania.
 He was a United States Senator for Oregon from 1871 to 1877, and later Chief Justice of the Oregon Supreme Court.
 Prior to his election to the Senate he had been elected to both houses of the local legislature, serving in the Territorial House and State Senate, and was a member of the Oregon Constitutional Convention in 1857.
William Jennings Bryan (March 19, 1860 – July 26, 1925) was an American orator and politician from Nebraska.
 Beginning in 1896, he emerged as a dominant force in the Democratic Party, standing three times as the party's nominee for President of the United States.
 He also served in the United States House of Representatives and as the United States Secretary of State under Woodrow Wilson.
 Because of his faith in the wisdom of the common people, he was often called "The Great Commoner".
George Frisbie Hoar (August 29, 1826September 30, 1904) was a prominent American politician and United States Senator from Massachusetts.
 Hoar was born in Concord, Massachusetts.
 He was a member of an extended family that was politically prominent in 18th and 19th century New England.
John Edwards (September 15, 1831 – March 11, 1891) was an American politician born in England.
The political positions of Pat Buchanan (born 1938), an American politician, columnist and news analyst, can generally be described as paleoconservative, and many of his views, particularly his opposition to American imperialism and the managerial state, echo those of the Old Right Republicans of the first half of the 20th century.
Thomas Minor Pelly (22 August 1902 – 21 November 1973), an American politician born in Seattle, Washington, served as a member of the United States House of Representatives from 1953 to 1973.
 He represented the First Congressional District of Washington as a Republican.
 Due to health concerns, he did not run for re-election in 1972.
 Pelly died while in California in 1973.
 Pelly is interred at Evergreen Washelli Memorial Park.
Niall Campbell Ferguson ( ; born 18 April 1964) is a Scottish historian.
 He is the Laurence A. Tisch Professor of History at Harvard University.
 He is also a senior research fellow at Jesus College, Oxford, a senior fellow at the Hoover Institution, Stanford University and visiting professor at the New College of the Humanities.
 He writes and speaks about international history, economic and financial history, and British and American imperialism.
 He is known for his provocative, contrarian views.
 Ferguson's books include "Empire: How Britain Made the Modern World", "The Ascent of Money: A Financial History of the World" and "Civilization: The West and the Rest", all of which he has presented as Channel 4 television series.

Question: Which prominent American politician born in 1860 and from Nebraska, made a speech about American imperialism in the Philippines?
Answer: William Jennings Bryan