Final answer:
NATO, a mutual defense alliance, was created after World War II to protect Western Europe and the United States against Soviet aggression.
Explanation:
NATO (North Atlantic Treaty Organization) was formed after World War II as a mutual defense alliance between the United States and various Western European nations. It was created to protect Europe and the West against Soviet aggression during the Cold War. Member nations agreed that an attack on one member would be considered an attack on all, leading to mutual military assistance.
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