Thanks for the reply jared. I will reply to some of your points below:
jarednjames said:
A 20ft fence, 15ft above ground, 5ft below ground. Floodlit and monitored with infrared and other such sensor tech. Guard towers every 100yds with armed, shoot to kill guards (well perhaps not that last one).
Ok, that means a minimum of about 100,000 guards stationed on the border. That's based on the assumption that each guard will do an 8 hour shift on actual guard duty each day. They do have to sleep you know. Also, unless anyone here has actually done guard duty in a situation where it was likely that they might get shot at, then you have no idea how much an 8 hour shift can take out of you.
Also, they're not going to be allowed to just shoot to kill on sight. The US, for all its faults, is not the USSR or Nazi Germany or anything even remotely like that. Even our most dickheaded bureaucrats wouldn't be allowed to ok something like that.
So, jared, while I might concede that an obstacle of the sort you describe might be built. I really don't think that the government will put 100,000 men on the border. How about 20,000 men? Not likely, but let's go with it. That means one man per 8 hour shift monitors 500 yards of fence. Ok, that might decrease the flow by, say, 10%, which means that instead of 500k per year there will be 450k per year coming into the US. Look, don't you think that whatever agency is charged with protecting our borders has already done any and all of the math that any of us is ever going to come up with? Bottom line, imho, the southern US border is, fapp, open, and will stay that way. The illegal immigration and drug transport will continue, pretty much unabated, for the foreseeable future. We simply don't have the political will, or the manpower, to stop it.