However, that is not what the administration and other major forces in this country want. Indeed, they want an armed fence on the southern border of Mexico. I believe that George Ure coined the term "Mexusnada" to describe the ongoing efforts to broaden NAFTA and create a single unified North American free trade bloc as a precursor to a single unified North American political entity.
create a single unified North American free trade bloc as a precursor to a single unified North American political entity.

How about this take:
Such a union, by refusing to join NAFTA, would wreck Bilderberg's long-standing goal of expanding NAFTA throughout the Western Hemisphere and evolving it into an "American Union" patterned after the European Union. The dollar would become the common currency of the American Union.

And the key part:
The dollar would become the common currency of the American Union.

http://www.thetruthseeker.co.uk/article.asp?ID=4641

As taken from a Twighlight Zone episode, Rod Sterling stands up and says "picture this, if you will, The USA removes it's borders to Canada and Mexico, Canada secures the most nothern of borders and Mexico secures it's most southern borders. Where the 3 countries are intertwined and enter into a NAFTA PLUS agreement as we enter the Twighlight Zone"

Nafta Plus

scary stuff! and this all started last August in the Waco Summit, (and would have been the topic of MSM) just before hurricane Katrina hit. But Katrina stole the thunder, and it was all brushed under the carpet.
This is why (as I see it) the administration has done nothing to secure the borders. They already know how this is going to play out. Oh, we can moan and groan, put up a Minute Man Project, but in the end, the politicians have it all wrapped up. We have no say/control on how this can be stopped. As far as the politicians are concerned, this Nafta Plus WILL happen!

Geez, we live in interesting times!  

If we let Mexicans to freely come and work in the US with with what little legal protections American workers have; minimum wage, workers comp, unemployment insurance, employers requirement to pay their share to Social Security and Medicare the number of Mexicans working here would probably go down. Opening the border is the last thing the Chamber of Commerce and National Association of Manufacturers want.