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NATO was formed

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Answered by GPT-5 mini AI
NATO (the North Atlantic Treaty Organization) was formed when the North Atlantic Treaty was signed on 4 April 1949 in Washington, D.C.

Founding members (12): United States, Canada, United Kingdom, France, Belgium, the Netherlands, Luxembourg, Norway, Denmark, Iceland, Italy, Portugal.

Purpose: a collective-defense alliance (Article 5 of the treaty says an attack on one is considered an attack on all), created in the early Cold War to deter aggression and promote transatlantic security.