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The North Atlantic Treaty Organization was created in 1949 by the United States, Canada, and several Western European nations to provide collective security against the Soviet Union. NATO was the first peacetime military alliance the United States entered into outside of the Western Hemisphere.

====Western Europe and the United States worked towards an international alliance====

In spite of general agreement on the concept behind the treaty, it took several months to work out the exact terms. The U.S. Congress had embraced the pursuit of the international alliance, but it remained concerned about the wording of the treaty. The nations of Western Europe wanted assurances that the United States would intervene automatically in the event of an attack, but under the U.S. Constitution the power to declare war rested with Congress. Negotiations worked toward finding language that would reassure the European states but not obligate the United States to act in a way that violated its own laws. Additionally, European contributions to collective security would require large-scale military assistance from the United States to help rebuild Western Europe’s defense capabilities.

The collective defense arrangements in NATO served to place the whole of Western Europe under the American “nuclear umbrella.” In the 1950s, one of the first military doctrines of NATO emerged in the form of “massive retaliation,” or the idea that if any member was attacked, the United States would respond with a large-scale nuclear attack. The threat of this form of response was meant to serve as a deterrent against Soviet aggression on the continent. Although formed in response to the exigencies of the developing Cold War, NATO has lasted beyond the end of that conflict, with membership even expanding to include some former Soviet states. It remains the largest peacetime military alliance in the world.

* Republished from [https://history.state.gov/| Office of the Historian, United States Department of State]

* Article: [https://history.state.gov/milestones/1945-1952/nato|North Atlantic Treaty Organization (NATO), 1949]

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