[hueving]

When you consider European countries are the equivalent of US states in size, you can easily grasp why it's so common for people to travel between countries in Europe.

I'm not sure if you intended to say Americans are intentionally insular, but if so, that's definitely not the case. It's just a side effect of being able to travel 2000 miles easily without ever leaving the US.

Additionally, in order to travel to another country other than Mexico/Canada, airfare alone for a family of 4 will be like 10% of the average annual household income so it's not really affordable for most Americans.