Americans are multi-cultural, and from all over the world. New York City is a life-style that comes with its own hustle and bustle ethos, and would be a terribly inaccurate subset for judging American males, as a whole.
My family is European as of only a couple of generations ago. American culture is world culture.
On a superficial and a commercial level.
Not on underlying layers.
The superficial and commercial level is what's incorrectly referred to as American culture by foreigners.
At home, most American families are FROM other parts of the world. Our food, not our fast food our home food, is from all over the world. Our traditions are from all over the world. Our values are from all over the world.
Our pop culture is copy catted....all over the world.
I would say after a couple of generations most American families become more American and less whatever culture they came from. Especially in generations past, and depending on where they're from. I grew up expressly American. On one side English heritage; the other side German, but this mattered not a whit. Just a pure American upbringing. We have a culture and make no mistake about that.
There's certain things that come with the American way of life, thats for sure.
In my experience, culturally anyway, the foods, holidays & traditions seem to maintain the influence of the family's roots.
That can get eroded over time, depending on the fabric of the family and how they decide to keep up with things or not.
After being sport, food and media-centric ~ Americans seem pretty diverse to me.