jan 1, 1949 - North Atlantic Treaty Organization (NATO)

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In a sharp departure from the American refusal to enter collective security agreements after WWI, the U.S. joined 11 European countries in a collective security pact in which an attack on one member was viewed as an attack on all. This set a new foreign policy of the U.S. of using collective security agreement to further it's military goals such as in Operation Desert Storm.

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