Since the depression of the 1930's millions of people have found solace in the world of fantasy. I don't mean the dragonslayers and hobbits and trolls and the like but being able to set aside their dull boring life for a while and escape to something new and different yet identifiable.

The superhero's were just like them most of the time. They were members of a society that the readers of the magazines of the times (the penny dreadfuls if you like) could relate too, identify with. Clark Kent was a nobody reporter until... {you know the rest}

Then it there is the society that is pretty unique to the USA. I don't mean to sterotype but the biggest is best, we are the greatest and all that razamatazz make these superheros fit right in whereas in other societies, hero's are much more low key, reserved and often totally eschew publicity. Take US Election Rallies. The Candidate is portraied almost as a Superhero, coming to save the world from the demons in the other party.

Self publicity is something that most Americans do very well. People who travel a lot know who is an american the moment they walk into a room/bar etc. That is not to denegrate Americans. It is just the way they appear to others. It is their unique style. Russians outside of Russia also have a readily identifiable style/persona.

There is a great documentary on the BBC I-player that was made by an american that if you can watch it is worth doing so.
https://www.bbc.co.uk/iplayer/episode/b0b8rc45/rich-halls-wo... (90 minutes long though)
If you can watch it, it gives those of us outside the USA a good insight into what makes the USA tick. The bit he describes about what happens when two Americans meet each other is just brilliant.

Other nations have their own style as well.

I'm sure that some University somewhere runs a PHD course on this very thing. Naturally, I could be totally wrong and barking mad.
Samantha