International organization to maintain peace (U.S. never joined).

• A. League of Nations
• B. Panama Canal Zone
• C. Moral imperialism
• D. U.S.S. Maine

Answer: (A)

The idea here is how nations sought a formal way to prevent future wars through collective action and diplomacy. The League of Nations was that body, created after World War I as part of the Versailles settlement to promote security by having countries resolve disputes peacefully, use arbitration, and, if needed, impose sanctions or take collective action. It was designed to keep the peace through cooperation rather than individual force.

The United States didn’t join despite supporting the goal, because many in Congress feared entangling alliances and believed joining would surrender too much sovereignty to an international organization. That hesitation helped explain why the U.S. stayed out.

The other options aren’t about an international peace organization: the Panama Canal Zone is a U.S. territorial area around the canal; moral imperialism is a concept describing how nations justify intervention morally, not an organization; the U.S.S. Maine was a battleship whose sinking helped propel the Spanish–American War, not a peacekeeping body.