What’s one word that was created by the Cold War?

MAD, for example. It was used in strategic thinking to refer to the possibility of mutual annihilation in the nuclear era; because attacking an enemy with nuclear capability could lead to your own elimination, then mutual deterrence restrained the two superpowers of the Cold War.  MAD means Mutual Assured Destruction.

I´ll give you a second one: "Domino theory." It was  a foreign policy notion risen in the 1950s in the USA. President Eisenhower said that if French Indochina fell into communist hands, then other countries  of Asia would follow , one after another as in the domino game.

Explanation:

declare war, appoint military officers, sign treaties, make alliances

a king decides to declare war on a neighboring country without the input of any advisers