This is not “MAGA Americans” characterization. It is the outcome of 2000+ years of history culminating in the U.S. being primarily populated by European peoples and the post WWII world order, with highlights including the Marshall Plan and NATO.
The Westphalian system of armed states had its legs chopped out from under it after 1945, but it's taking a while for a new way to materialize.
This is one of the reasons why the Absolute Worst Thing is a nuclear-armed state with uncertain borders. Look around the world and you'll see that the "trouble spots" we spend a lot of time looking at in the news, are those places where nuke powers get to feeling itchy and twitchy about where exactly their countries end.