Really depends.
America is not just one thing.
Well except it used to be more dedicated to freedom and finding your path now they all want to be baby sat, but I digress.
America is huge, both in land mass and culture. It truly is an amalgamation of all that built it.
Sure you can say blue jeans, pop music , fast food, Pizza.
America is an Idea. Borrowed rather heavily from Locke
We hold these truths to be self-evident, that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. (Locke said property.)
They may not have always remembered that. As a very young country like many youth they had a plan and tons of enthusiasm.
The culture is the future is theirs, its is a firm belief that no matter how politically incorrect it is America is the best.
In their hearts most feel that; sure they whine about this or that, but even the very rich and disgruntled rarely actually leave.
optimism is Americas culture.