Formation of NATO
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.
http://www.coldwar.org/articles/40s/NorthAtlanticTreatyOrganizationNATO.asp
http://history.state.gov/milestones/1945-1952/NATO
http://www.coldwar.org/articles/40s/NorthAtlanticTreatyOrganizationNATO.asp
http://history.state.gov/milestones/1945-1952/NATO