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I can really only speak for my own country, but here's my take:
Peak United States culture was in the 1930s to the 1950s; it was mostly straight white upper class men who had the most say in anything or enjoyment in life, and technology sucked shit compared to now. Having fun as we're familiar with was almost impossible to do because you almost always had a real life responsibility to fulfill and sitting around on the internet was literally nonexistent in every sense of the word.
Artists such as Dean Martin, Frank Sinatra etc. were peak class and wholesomeness as well as films such as Citizen Kane and actors in other films like John Wayne. Everyone conducted themselves with an element of proper, appropriate class and you rarely ever saw the use of nudity or even so much as swear words in media.
The 60s and earlier 70s brought things like drugs, musical experimentation and emphasis on civil rights, with a whole new generation (the boomers) to lift it into dominance. Some movies and songs in the early 1960s have a unique soulfullness as well as newfound creativity due to some backwash from the 50s carrying over and fusing with all the new shit that was happening, but the way people conducted themselves was heavily deviating away from tradition and appropriateness.
The later 70s and then the 80s saw the same thing but with newer technology which allowed people to get lazier than before on some fronts, and more people tried to outdo each other in more bombastic ways such as usage of synths in music or number of explosions in movies, etc. But it was mostly carefree fun, albeit getting extremely repetitive to the point of many people being seen as corny and nothing really seeming new anymore (at the time), let alone having true class or appropriateness.
The formula broke in the 1990s as well as tensions from the cold war, and more people started relaxing and expressing themselves in a more genuine way. Creativity and technology flourished a little once more.
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