My multiple full passports say otherwise.
> Shame on all those money you wasted travelling then because you clearly didn't make good use of it.
I'm happy with my experiences. I'm not sure what parts of the world you went to, but most of the world is /very/ homogeneous. There are parts of the world that are more diverse than the US, on some variable, for instance pretty much anywhere in Africa is more ethnically and linguistically diverse than anywhere in the rest of the world. But in the mix of things, the US is not the most diverse country, but is very much near the top. Canada is more diverse than the US, as an example, but the US is more diverse than essentially any country in Europe, any country in South America except perhaps Brazil, and most countries in Asia. It somewhat depends on what you mean by "diversity"? But the US has a mix of ethnic groups, religious groups, and cultural groups, as well as languages. You only don't see it because of assimilation over generations, but each of the groups leaves their mark on those regions in the US.