I currently live in Europe and it seems to me like the middle class (and more generally, people who can afford a trip or two a year) are always very keen to do long international trips. Southeast Asia and Japan are very popular destinations and I feel like I always have a colleague or two who are planning a trip there. But I also know plenty of people that go to less known places in Africa or South America.
Is that common in the US? Do Americans who can afford to travel often go that far? Or do they prefer to stay in the US or going to Canada or Mexico?