alt Hacker NewsThere were lots of administrations who could have said to other countries ,,let's get rid of the nukes together'' while USA was the only string power.
Deescalation stopped because of people in general not caring enough (and making money of being the biggest power), not because of administrations that come and go.
As to the immigration situation: we know that governments are not executing in general how they should be, but people are able to enforce some policies if they fight together united and in agreement. But right now they are not in agreement.
> There were lots of administrations who could have said to other countries ,,let's get rid of the nukes together'' while USA was the only string power.
There was only one administration with that opportunity, really; Truman.
Every other administration has had a nuclear armed Russia in play.
Attempts to do what you describe were still quite common, starting as early as the 1950s. https://en.wikipedia.org/wiki/Nuclear_arms_race#Treaties