What term describes a formal agreement between two or more nations to cooperate and defend one another?

• A. Alliance System
• B. Economic Union
• C. Nonaggression Pact
• D. Cartel

Answer: (A)

The idea here is an alliance. An alliance is a formal agreement between two or more nations to cooperate on security and mutual defense, meaning members pledge to support one another if any member is attacked or faces a threat. This kind of pact shapes how countries respond to international crises and helps deter aggression by showing a united front. For example, post-World War II organizations like NATO are built on this principle of collective defense.

Economic unions focus on trade and economic policy rather than defense commitments. A nonaggression pact is a promise not to attack each other, but it doesn’t require active defense or joint action if one side is threatened. A cartel is an arrangement among businesses to control prices or production, not among nations for security.