This american age is “dreary” in comparison -- “unless you’re an american.” what does this line , said by jimmy in look back in anger, imply ?

Jimmy being an educated intellectual is commenting on thr international politics of the then times when America is ascertaining it's superiority and British is losing its colonies ...

Jimmy in look back in Anger is very conscious of his British identity and therefore he is jealous that AMERICA has become the new superpower after the end of world war 2. so what h...