An organization established in the United States in 1898, it vocally opposed the nation’s policy of territorial expansion following the Spanish-American War. Its members, drawn from a diverse cross-section of society, argued that imperialism violated fundamental American principles of self-governance and consent of the governed. Prominent figures like Andrew Carnegie, Mark Twain, and Jane Addams lent their voices to the cause, advocating for the independence of nations such as the Philippines. The League employed various methods to publicize their views, including publishing pamphlets, delivering speeches, and lobbying government officials.
The significance of this movement lies in its articulation of an alternative vision for American foreign policy, one rooted in republican ideals and focused on peaceful relations rather than colonial domination. It provided a crucial counter-narrative to the prevailing expansionist fervor of the time, raising important questions about the relationship between democracy, national identity, and global power. Although it ultimately failed to prevent the acquisition of overseas territories, its efforts contributed to a broader debate about America’s role in the world and the ethical implications of its foreign policy decisions. Its legacy continues to inform discussions about American exceptionalism and the limits of interventionism.