Way back about 1972 or thereabouts, my junior year in college and needing an elective, I signed up for an Anthropology class; North American Indians. Turned out to be one of the more interesting courses I took. Anyway, one day the Proff got to philosophizing and stated “all borders are temporary”. For some reason her comment has stayed with me all these years. And, when this topic comes up it comes to mind. Anyway, read a book awhile back, “The Next 100 Years, George Friedman, 2010” that makes some interesting projections about the future relationship between the US and Mexico. It’s on Amazon and an easy read. If you’re interested in this subject suggest you give this book a try.
“Anyway, one day the Proff got to philosophizing and stated “all borders are temporary”.”
Here is another way to think of it. Throughout human history, you only own territory which you are able to defend. Land may have belonged to your people for 2000 years, but if another group takes it, it belongs to them until you can take it back. The animal kingdom works the same way.