Excerpts from Books and Wikipedia
This anti-Soviet defence force included the United States, Britain, Canada, France, Belgium, The Netherlands, Luxembourg, Denmark, Norway, Iceland, Italy, and Portugal. Greece and Turkey joined later in 1952, and West Germany joined in 1954. [Cambridge Illustrated History of Warfare, p. 383] "The NATO alliance did militarily what the Marshall plan had done economically; it deepened the 1945 division of Europe into two camps, with only traditional neutrals (Switzerland, Sweden), Franco’s Spain, and certain special cases (Finland, Austria, Yugoslavia) in neither one nor the other. It was to be answered, in due course, by the Soviet-dominated Warsaw Pact." [Kennedy: Great Powers, p. 379]