http://en.wikipedia.org/wiki/Nation_statenotice how a.) it's not even desirable to be a nation state, so untwist your knickers everybody:
"The most obvious impact of the nation state, as compared to its non-national predecessors, is the creation of a uniform national culture, through state policy. The model of the nation state implies that its population constitutes a nation, united by a common descent, a common language and many forms of shared culture. When the implied unity was absent, the nation state often tried to create it. It promoted a uniform national language, through language policy. The creation of national systems of compulsory primary education and a relatively uniform curriculum in secondary schools, was the most effective instrument in the spread of the national languages. The schools also taught the national history, often in a propagandistic and mythologised version, and (especially during conflicts) some nation states still teach this kind of history.[10]
Language and cultural policy was sometimes negative, aimed at the suppression of non-national elements. Language prohibitions were sometimes used to accelerate the adoption of national languages and the decline of minority languages (see Germanisation)."
Sure, when America was by and for white upper class males, it was a nation state, or something. Good for you, can we move to today now?
The clincher is the list of examples of nation states on that page. Read it. Notice how the USA isn't on the list. So you can blah blah blah all you want, the downvoted poster is correct, the rest is not. What a surprise ^^