If it was meant as a cliché, that is. America -- the country filled with people, not the state -- is indeed a great subject for a writer. Below the pop culture/corporate surface exists myriad stories and complex lives that are unique to a massive, multiethnic, relatively free society. I don't know if Hitch is alluding to this specifically, but as I get older I find it to be the case, and it never ceases to fascinate me.
As for the "idea," it depends on what you're talking about. If you mean the Bill of Rights and the Constitution, then no, I wouldn't consider it a cliché, especially now.
DP