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Germany, Italy and Japan signed a mutual defense treaty.
United States Secretary of Defense was created in 1947.
United States Department of Defense was created in 1947.
Organization of Ibero-American States was created in 1985.
Trotskyist Organization of the United States was created in 1974.
Air Defense Artillery Branch - United States - was created in 1968.
The Warsaw Pact was a political and military alliance formed in 1955 among the Soviet Union and its Eastern European satellite states as a response to NATO. It served as a counterbalance to Western influence during the Cold War and was dissolved in 1991 with the end of the Cold War.
The First "Organization" to use the Internet is in fact the The United States Department of Defense. It was called ARPANET and it was developed by DARPA, an agency from the Department of Defense
The North Atlantic Treaty Organization originated in 1949. It was created bu the United States, Canada and several Western European countries to provide collective security against the Soviet Union.
NATO
Canada is a founding member of the North Atlantic Treaty Organization and the United States sole northern neighbor. Due to Canada position along the arctic, adjacent to which is Russia, are early warning concerns to the path of incoming ICBMs and bombers. Canada has both territorial & airspace national security concerns and a mutual defense interest with the United States into joining NORAD as a defense to these threats.
Confederacies tend to be unable to organize for mutual defense and police trade disputes between different member states.