Reminder too that literally everyone is one country-ending catastrophic event away from being on a refugee boat
When China, Western Europe, or the US collapses into civil war refugees from those countries do indeed migrate. The problem is other countries start collapsing as well because they were dependent on some form of trade with those regions. As a result its unlikely there will ever be a large scale exodus of people from the US. We'll all just be survivors in the wasteland at that point.
There's a reason migrants take the Mediterranean route, instead of the Atlantic route.
Why? As a Minnesotan, the first thing I'm doing is hopping on my boat and heading north to Canada.
Fukushima a) happened and b) Japan and the world are still there
A lot of the Central American refugees are fleeing very sharp increases in gang violence.