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NATO

Definition

The North Atlantic Treaty Organization (NATO) is an international alliance that consists of 30 member states from North America and Europe. It was established at the signing of the North Atlantic Treaty on 4 April 1949.

Related terms

Collective Defense: This refers to the concept that if one member of an alliance is attacked, all members will respond and defend that nation. It's a key principle behind NATO.

Article 5: This is the article in the NATO treaty that embodies collective defense. It states that an armed attack against one or more members in Europe or North America shall be considered an attack against them all.

Cold War: A period of geopolitical tension between powers in the Eastern Bloc (the Soviet Union and its satellite states) and powers in the Western Bloc (the United States, its NATO allies). The creation of NATO was a significant event during this period.

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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.