In response to this.
Although it is true that a majority of the nation has lived in America for at least two generations (arbitrary amount of time, but I am not sure how many generations defines an immigrant family versus a native one), I think that Americans still view the immigrant story as one that is truly American. I do not consider myself an immigrant, but I still feel as though America is always being changed by immigrants, and because I am an American, this immigration becomes a small part of me. This small part is something that all american have in common. With regards to your comments on an American culture, I would say that I do not dispute the presence of an American culture, but that I believe this culture is constantly changing, and therefore hard to pin point. Yes, TV is different in other nations, but in the matter of 5 years TV has changed in the US alone. When you watch a show that aired a while back, it has a whole different feel from a show today. Both feelings conjured by these shows are steeped in American culture, but because our culture has evolved over time, the feelings are different.