Eh, I disagree. I'm an American that has never had the resources to visit another country. I know many people like me that would agree with what I'm about to say. My lack of physical travel is maybe a small roadblock to understanding how other places operate, but we still live in an age of absurdly high access to information.

The issue isn't that Americans aren't traveling and experiencing other places to learn about alternative ways of thinking and governance. The issue is that many Americans (conservatives being overrepresented) have no drive to question American exceptionalist propaganda or their own worldviews. The information is there, but it doesn't do any good if a person intentionally avoids learning it.