Without wanting to sound too cynical, I thought this was a sort of PR ploy to reassure the poor and immigrants that it wouldn’t be this bad perpetually and that eventually they would be living the good life. For it to be a peculiarly US trait, could one say that it is not true that the little guy can make it in most other countries?
As for my own country (the UK), over the last few years, I’ve heard increasing allusions to British values. Apparently they are, amongst others
and
The second one is rather insulting to the rest of the world.
I don’t see how we aspire to these value any more greatly than the majority of other nations so I think it’s just meaningless bilge.