Arms race

An arms race is a competition in which states build up military capabilities in response to one another. Each side’s efforts to gain security or advantage can prompt further expansion by its rivals.

Security dilemma: A situation in which one state's measures to increase its security make other states feel less secure. It explains how defensive steps in an arms race can provoke rival buildup.
Anglo-German naval arms race: The pre–First World War competition between Britain and Germany to expand and modernize their navies. It is a prominent example of shipbuilding competition intensifying strategic rivalry.
Thucydides: An ancient Greek historian whose account of the Peloponnesian War links Spartan fear of Athenian growth to the war's cause. His account is often cited as an early description of fear driving competitive military responses.
Nuclear deterrence: The use of nuclear retaliation threats to discourage an adversary from attacking or escalating a conflict. Nuclear arsenals can deter attack while making miscalculation potentially catastrophic.
Disarmament: The reduction or elimination of weapons, armed forces, or military capabilities. It reverses the buildup at the center of an arms race.
Action–reaction model: A model in which one actor's choices prompt responses from another, producing a cycle of reciprocal behavior. Arms races often unfold as successive responses to an opponent's weapons and deployments.
Dreadnought: A large battleship design introduced by Britain in 1906, distinguished by its uniform main battery and steam-turbine propulsion. Its launch reset naval standards and accelerated battleship construction among rival powers.
Peloponnesian War: A war between Athens and Sparta and their allies from 431 to 404 BCE. Thucydides' explanation of its causes has shaped modern thinking about rivalry and buildup.
Mutually assured destruction: A condition in which opposing nuclear powers can each inflict unacceptable destruction after a first strike. It captures the paradox of stability through the threat of mutual annihilation.
Unilateral disarmament: A state's decision to reduce or eliminate weapons without requiring reciprocal action by other states. It contrasts with matching a rival's buildup through reciprocal reductions.

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