U.S. Rep. Ron Paul, a Texas Republican known for his Libertarian views,

In Europe from the fall of Napolean until the eve of ww1 travel was virtually unencumbered. The universal adoption of gold as money resulted in a commerciall culture, largely unconcerned with borders. Even during the war, the generals had trouble keeping the troops hating each other. Incidents of spontaneous peace breaking out were widespread. Free trade, including free trade of honest money will lead the eventual dissolution of borders.

I remain an optimist that the relentless progress of man, his inate desire for well being, and the ultimate triumph of of classical liberalism will dissolve borders over time. Until then, getting as much labor trade with Mexico, the rest of South America and the world as is politically possible is a good , but not perfection.