The North Atlantic Treaty Organization (NATO) is a mutual defense pact founded by the nations of Western Europe, the United States, and Canada in 1949, originally intended to counter the Soviet Bloc. Upon the outbreak of the Third World War, NATO aided the Allies of the Third World War, fighting in Europe. After the Soviet Union used the Nuclear Bomb on Anchorage, NATO and its allies held the Montpelier Conference on the possibility of peace with the Soviet Union. The United States and Canada opposed withdrawal, as they had both been attacked directly, while the coalition for peace was mostly unharmed. It was resolved at the conference to make peace with the Soviet Union, and together the members of NATO attended the Sao Paulo Peace Accords.