The balance of terror
The "Cuban missile crisis", in 1962, was the culmination of the danger for the whole of humanity.
Paradoxically, however, it ushered in a new period in the relationship between the American bloc and the Soviet bloc: "peaceful coexistence", based on the new principle of the "mutually assured destruction deterrent", i.e. on a "balance of terror".
The struggle between the two "Great Powers" gradually moved onto peaceful ground, where propaganda endeavoured to establish the superiority of an ideological system by vaunting its technological successes: the conquest of space.