West Germany (the Federal Republic of Germany) West Germany joined NATO the day after the Bonn-Paris conventions came into effect and its status as an occupied country came to an end. East Germany joined the Warsaw Pact when it was formed a few days later on 22 May 1955.
The North Atlantic Treaty was signed in Washington, D.C. in 1949 by Belgium, the Netherlands, Luxembourg, France, UK, US, Portugal, Italy, Norway, Denmark, Canada and which other country?