According to this Forbes article, the US ranks 10th as the happiest nation following nine "socialist" countries.
The World's Happiest (And Saddest) Countries - Christopher Helman - Forbes
Now, what does that say?
It coulde say a bunch of stuff. For instance, it could mean that in the USA, the living conditions are horrible and the people see them for what they are and know for a fact that everybody else in the world bar none has it better and our lot in life just plain sucks.
It could also mean that no matter how good it is, people in the USA always see room for improvement and have learned through experience that if we just work a little harder, put in a little more effort and team up a little better with our peers, we can convert what's good into something better.
If yon Cassius is fat and happy, Ceasar lives. If he has a lean and hungry look, better wear a daggar proof vest. Ambition breeds best where there is room to grow.