NATO and Warsaw Pact · World History

What is the primary collective defense principle established in Article 5 of the North Atlantic Treaty?

  1. An attack against one member is considered an attack against all
  2. All members must use the same currency to ensure economic stability
  3. Nuclear weapons must be shared equally among all member states
  4. The United States has the right to veto the domestic laws of other members
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Correct answer: An attack against one member is considered an attack against all

Article 5 is the cornerstone of NATO, ensuring that the alliance's collective power serves as a deterrent to aggression. It has only been invoked once in history, following the September 11 attacks on the United States.

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