David Coleman
In one form or another, deterrence is a motivational force in many everyday relationships: a child learns not to misbehave for fear of being scolded by its parents; a potential criminal might decide against committing a crime for fear of being caught and punished; a nation may choose one foreign policy course over another out of fear of military or economic retaliation; or an international alliance may threaten war if any one of its members is attacked. In each case, one party has influenced the choice of another by threatening consequences that outweigh gains.
In the field of foreign policy, the threat and fear of retaliation has been a powerful force. Imperial powers have found that making an example of an enemy or lawbreaker ultimately provided a cheaper and easier method of controlling peoples than maintaining a large standing police or armed forces, conforming to the common adage that prevention is usually better than cure. To that end, Roman legions deliberately cultivated a reputation for ruthlessness to promote stability, and European imperial powers did everything they could to impress their technological and military prowess upon the peoples they commanded. But it is in the nuclear age that deterrence assumed a special significance and was refined from a mostly instinctive practice to a deliberate, if still inexact, science. Throughout the nuclear age, deterrence has been a dynamic concept propelled by technological and historical developments. In turn, the concept of deterrence came to influence those technological and historical developments.
See also ARMS CONTROL AND DISARMAMENT; BALANCE OF POWER; COLD WAR EVOLUTION AND INTERPRETATIONS; COLD WAR ORIGINS; COLD WAR TERMINATION; DOCTRINES; NUCLEAR STRATEGY AND DIPLOMACY; POST–COLD WAR POLICY; PRESIDENTIAL POWER; SUPERPOWER DIPLOMACY.