That sentence made me burst into laughter. The US is an amalgam of different cultures, yet you have never experienced other cultures? How about the Mexican one? Or the African one? or the Jewish one?
I have a 100% Jamaican friend who would laugh as well if I told him I have experienced Jamaica because he cooked for me or told me about Kingston. Wow, I have even seen pictures of his family and home so I guess I have seen it all. I have never been there and that makes a big difference.
What I meant by experiencing other cultures is being able to talk about them because of an actual visit there where I live according to their rules, ethics, laws, made friends, can speak some of the language etc.
No doubt there are festivals, music, food, etc from other cultures but GENERALLY SPEAKING this is the USA. When in Rome do as the Romans. Just because I went to Polish Fest in Milwaukee doesn't mean I know Polish culture. I know little of Poland right now.