I agree with Post #4. As an American I feel a certain sense of pride in my country, but would have to say some of the reasons I believe and do certain things is because of my European roots. When I do or say certain things, I hear people say, "Oh it's just your fiery Irish temper flaring again!" or "You're built like an English schoolhouse," or "There goes that German stubborness again!"
I wonder how much of who I am today is because of my ancestry and how much of it is because I was born in America. I would have to say if there is a central culture in this country, it would have to be our national pride, our patriotism, our sassy, self-confident, cocky natures, our love of family. We have stayed a nation for over 200 years because we hate tyranny, oppression, and bondage.
Do the following factors determine our culture?
Dialect: Maybe (As a whole we do speak distinctly different English from other countries.)
Values: Maybe (If you consider freedom a value, then yes.)
Artistic Movements: No (Many nations are much more artistic than we are and art is pretty much a worldwide thing, with no distinctions of border and country.)