The difference between countries is always greater than that between cities. LA to NYC is not the same as NYC to London. Even then you're still speaking the same language. How would you deal with a language barrier? Different religions? Different laws? You'll never get the perspective of an immigrant in the US, but you would being a foreigner in another country.
I'll be happy to compare passports. Let's start with how many months you have lived outside the US. (I've have three months in Europe, plus trips. I also have trips to the Philippines, Fiji, Equador, and others.)
And, since you're claiming that the US is culturally uniform, where in the US have you lived? If the SF bay area, what parts of Oakland, SJ and PA have you experienced? (No, getting ribs at Everett and Jones doesn't count.)
I've lived in both EPA and black Oakland, in addition to "fly over country". I've even done farm labor (and my father did it as a migrant).
> Even then you're still speaking the same language.
Interestingly enough, I referred to places in the US where English is not the dominant language.
My point still stands, you won't find as large a cultural gap as you would traveling to another country.
> Interestingly enough, I referred to places in the US where English is not the dominant language.
Of course you'll find small populations of foreign speaking people in the US, just as you would in any country but you're missing the point. You can't compare going to Chinatown with actually going to China, that's ridiculous.