Which term describes a system where many nations act together to preserve peace, often through collective action?

• A. Multilateralism
• B. Isolationism
• C. Collective Security
• D. Hegemony

Answer: (C)

Collective security is a system where many nations act together to preserve peace, often through collective action. In this setup, member states agree that an attack on one is an attack on all, committing to respond as a bloc to deter or counter threats. That shared, coordinated promise to act against aggression is what makes this concept fit the description best. Multilateralism also involves many countries working together, but it centers on cooperation and decision-making rather than a formal pledge to defend every member. Isolationism is about avoiding international involvement, and hegemony refers to domination by a single state.