Final answer:
NATO was developed in 1949 to provide stability and security to Western Europe, ensuring collective security among its member nations against potential Soviet aggression.
Step-by-step explanation:
To provide stability and security to Western Europe, several nations joined forces to form the North Atlantic Treaty Organization (NATO) in April 1949. This included the United States, Canada, and ten Western European countries such as Britain and France, with additional members like Greece, Turkey, and West Germany joining later. NATO was established as a collective security system, where an attack on one member would be considered an attack on all, committing to mutual military assistance. This organization was a response to the Soviet Union's power demonstrations in the Security Council of the UN, and in turn, prompted the USSR to create their own alliance, the Warsaw Pact.