Unlike the Mexican border -- which is half as long - no drug war or chaos rages in the north. Arrests and drug seizures in 2008 totaled less than 1 percent of those down south.
We are being governed by brain addled, PC idiots, as the two above statements well illustrate. This might also be a deliberate plan to move some assets to the north to weaken the southern border even more. Nothing can be ruled out considering the nitwits now in charge.
Suggest a read of Ayn Rand's Atlas Shrugged. You'll be near the end before you see it (warning: it's a long read), but you'll recognize it in a flash.