Although shunned for decades by the leadership of both the Democratic and Republican parties, nonintervention in foreign policy may be the option most consistent with the liberal republicanism that characterized the American Revolution. Domestic opposition to U.S. interventionism has shown a moral and ideological continuity that links the opponents of the War of 1812, the Mexican War, and the Spanish-American War to the opponents of World War I, World War II, the Cold War, Vietnam, and all the later wars.