Why put up artificial barriers? Who benefits from this arrangement?
Answer? Those who have an interest in sovereignty to begin with, and those
who are interested in having a cheap labor force.

The real questions might be why doesn't Mexico demonstrate some
initiative and employ it's citizens? Develop some industry, end the
corruption, and catch up with the rest of the industrial world.

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….