Earlier quoted context omitted.
The term "nation" typically means a collection of people with a common culture and ethnicity. The "Poles" are a nation, Poland is a state. That's why the the term nation-state exists, and contrasts with, say, empires composed of multiple nations. Canada, for example, traditionally described as a binational state, is now typically identified as a multicultural state, with some Québécois disliking the change in emphasi…
America absolutely has a culture. Have you never lived in another country? Our houses, cars, schools, music, food, pass times, athletics, language (slang, dialects), entertainment, government, habits, communication (verbal, body language), aspirations, societal expectations, humor, things we find offensive/inoffensive, etc.
One can, of course, feel entirely free to use words in arbitrary ways. But to correct someone (who clearly understands the correct usage of the term nation) with the nonsensical notion of a nation imposing taxes is odd.