...was the direct result of the unique experiences of WW2.
First, the US - despite the existential military challenge from the Soviet Union, which was only possible due to the disproportionately cheap annihilatory threat of nukes - was basically unchallenged as Earth's superpower economically, culturally, and militarily.
The rest of the world was still recovering from the aftereffects of WW2, from which the US had emerged largely unscathed but with a newfound taste/appreciation for the power of its science & industry marshaled by a central government (again, born of WW2).
At that same time, you had an entire generation of men that came back from war with a "we can accomplish anything" confidence (which in some cases tragically proved to be a dangerously entitled arrogance) AND an understanding that some things in the span of human events were WORTH the sacrifice of life and treasure. They accepted that.
I doubt we'll ever see such a time again.
We live in what remains the wealthiest, most comfortable society ever in human history, yet we still can't afford everything we buy.
47 years ago, we celebrated the triumph of landing people on the moon. In a short time, it became so pedestrian that it wasn't even front-page news anymore.
Today's triumphant news is about a new Tinder app that lets you 'hook up' with multiple people.
I know it's very "get off my lawn" but where we had an outward-looking, achievement-oriented society 50 years ago, today I see nothing but an enervated country suffused with ennui and a narcissistic obsession with carnality that leaves us paralyzed like a heroin addict on a buzz.