It’s not isolationism. It’s mind-our-own-business-and-tend-to-our-own-affairsism. Let’s do something about our own wide open “sacred borders.”
“mind-our-own-business-and-tend-to-our-own-affairsism”
AKA isolationism.
The sacred borders are due to an internal US conflict of interests. Some powerful Americans want the border open. You and them have a beef. Resolve that beef by beating those interests and you will close the border. It has nothing to do with Ukraine.