The American Anti-Imperialist League was an organization established on June 15, 1898, to battle the American annexation of the Philippines as an insular area. The anti-imperialists opposed forced expansion, believing that imperialism violated the fundamental principle that just republican government must derive from "consent of the governed." The League argued that such activity would necessitate the abandonment of American ideals of self-government and non-intervention—ideals expressed in the United States Declaration of Independence, George Washington's Farewell Address and Abraham Lincoln's Gettysburg Address. The Anti-Imperialist League was ultimately defeated in the battle of public opinion by a new wave of politicians who successfully advocated the virtues of American territorial expansion in the aftermath of the Spanish–American War and in the first years of the 20th century, although the organization lasted until 1920.

William Jennings Bryan was an American lawyer, orator, and politician. Beginning in 1896, he emerged as a dominant force in the Democratic Party, running three times as the party's nominee for President of the United States in the 1896, 1900, and 1908 elections. He served in the House of Representatives from 1891 to 1895 and as the Secretary of State under Woodrow Wilson from 1913 to 1915. Because of his faith in the wisdom of the common people, Bryan was often called "the Great Commoner", and because of his rhetorical power and early fame as the youngest presidential candidate, "the Boy Orator".