I'm sure that's true for many people. When European tourists visit the US, however, how many are actually going deep into the interior of the US? Most tourists, I'd imagine, would be staying somewhat near one of the coasts and mainly sticking to the major cities. I doubt many Europeans have anywhere in Nebraska on their itineraries. Probably not a ton of European tourists in the US right now anyway, but I mean in the recent past at times of relative political normalcy.

It makes sense, though. Most people who are travelling don't have the time or money to spend months seeing all the highlights of a place as large as Europe or the US. Even just these countries offer a ton to see, whether its the cities or the countryside. I can't speak for how well-traveled Europeans are, but very few people in the US, even those who have lived long lives here, are able to say they've even visited every state, let alone seen the whole country. I bet that's probably true of Europe for Europeans, too.

I myself don't have much money for travelling, so I've only been to 11 states (and never even left the country), and I certainly did not see everything those states had to offer. Some states are often called "fly-over" states and, frankly, aren't usually considered worthwhile places to visit anyway (even by Americans), so you can be forgiven for skipping those. I'm sure Europe has its equivalents, too.