One of the amazing things about the US the wide varieties of cultures, cuisines, and natural beauty it contains. I love Europe and would love to travel in Asia some-day but for much less cost I can explore the great variety of my home country.
I'm surprise you say that, having visited different countries. The variance in culture and cuisine within US is insignificant respect to the world as a whole. I live in South America, and visited South Asia, North Africa, Eastern Europe, North America and the Caribean. I've been to both coasts and center of the US, and can attest that deep down you're all the same.
You want to say different cultures, think of Tokio vs Marrakesh. That's difference.