There's a pretty sizable proportion of USians that have a hard time accepting that other countries exist.

For what it's worth, we're also starting to have similar (though so far less pronounced) reactions to domestic travel. There's a number of states that are unsafe to travel to if you or someone in your family has a gender identity that's not on the approved list--and that has an outsize effect. I won't go to those places since they don't deserve my tax dollars, and am just jumping on a bandwagon of plenty of other people in making that decision.