Bush was responsible for much of it gaining traction under the guise of "Security and Prosperity Partnership of North America" and things like Perry's Trans-Texas Corridor were going to make up the North American Super Corridor which was going to link everything.
The bad thing is, this kind of stuff, whether the TTC or the SSP, was going on in plain sight. We thought it was dead with Bush's administration winding down, but Obama
appears to be resuscitating it under a different name.
Unfortunately, the conspiracy nuts like Ron Paul and Alex Jones take discussion of this to the extreme and so normal people are reluctant to even look into it, but it's been happening. There was a reason why Bush dragged his feet on securing our southern border.
Texans' fight against Perry's corridor is going to be more important over the coming years than people now realize.