I kind of think of the 50s as kind of a major turning point for the US. There were a lot of seeds of greatness then that weren't properly nurtured in the following decades so that they could grow.
While just about every other country in the world was trying to put themselves back together from WWII, we had emerged not only unscathed, but in almost every measure better than we were before. We had military might, we had a booming economy, manufacturing, science, technology, arts, entertainment, cars, appliances, TV, electricity all on a scale previous generations could only dream about.
Even if you were part of a marginalized group- black, LGBTQ, female, etc. there were some glimmers of hope that looked like things might get better soon- the civil rights movement was picking up steam, there were some early LGBTQ rights movements and demonstrations taking shape, women entered the workforce in a big way during the war, and after the war mostly returned to the home afterwards but those seeds were planted, I don't think it's a coincidence that little girls growing up in the 40s watching the women in their lives being the Rosie the Riveter would become the ones who embraced 2nd wave feminism 20 or so years later.
And of course we had high corporate taxes helping to fund it all.
It wasn't all sunshine and roses of course, and you will certainly find no shortage of people here on Lemmy who will happily spell out all of the many reasons the 1950s sucked, and I don't disagree with them, but that's not what you asked, so I'm not going to go into that.
The 50s were a major leap forward in the quality of life for many people in america, and while far from perfect, there is definitely an angle you can look at it from where things looked like they were more-or-less on the right track.