Arms race

1909 cartoon in Puck shows (clockwise) US, Germany, Britain, France and Japan engaged in naval race in a "no limit" game.

The size and power of battleships grew rapidly before, during, and after World War I: a result of competitive shipbuilding among a number of naval powers, brought to an end by the Washington Naval Treaty

From 1897 to 1914, a naval arms race between the United Kingdom and Germany took place.[2] British concern about rapid increase in German naval power resulted in a costly building competition of Dreadnought-class ships. This tense arms race lasted until 1914, when the war broke out. After the war, a new arms race developed among the victorious Allies, which was temporarily ended by the Washington Naval Treaty.

In addition to the British and Germans, contemporaneous but smaller naval arms races also broke out between Russia and the Ottoman Empire; the Ottomans and Greece; France and Italy; the United States and Japan in the 1930s;[2] and Brazil, Argentina, and Chile.

United States and Soviet Union/Russia nuclear weapon stockpiles

This contest of the advancement of offensive nuclear capabilities occurred during the Cold War, an intense period between the Soviet Union and the United States and some other countries. This was one of the main causes that began the cold war, and perceived advantages of the adversary by both sides (such as the "missile gap" and “bomber gap”) led to large spending on armaments and the stockpiling of vast nuclear arsenals. Proxy wars were fought all over the world (e.g. in the Middle East, Korea, Vietnam) in which the superpowers' conventional weapons were pitted against each other. After the dissolution of the Soviet Union and the end of the Cold War, tensions decreased and the nuclear arsenal of both countries were reduced.

Charles Glaser argues that numerous cases of arms races were suboptimal, as they entailed a waste of resources, damaged political relations, increased the probability of war, and hindered states in accomplishing their goals. However, arms races can be optimal for security-seeking states in situations when the offense-defense balance favors offense, when a declining state faces a rising adversary, and when advances in technology make existing weapons obsolete for the power that had an advantage in the existing weaponry.[2]