During this time period, the united states decided to stop treating communism as a single unit and tried to slow the nuclear arms race. containment apropos détente antebellum

It would be during the time of "Détente" that the United States decided to stop treating Communism as a single unit and tried to slow the nuclear arms race, since it became clear that the continuing stock-piling of weapons was detrimental to both sides. 

I'm pretty sure that's called a volcano