It costs a few billion to build a wall to current standards that can be easily breached in a few minutes and is impossible to patrol.
It'd be a lot better than what we currently have.
A July 29, 2010 Rasmussen Reports nationwide poll revealed that Americans favored building a fence along the U.S. border with Mexico, with 68 percent in favor and 21 percent against (margin of error: +/- 3 percentage points)
If you want more than a really expensive symbolic gesture to racists and xenophobes, it will cost much more than that.
So 68% of the country are racists and xenophobes?
Though even with the number you go with, that's still a terrible deal for Mexico.
Like I said, I'd include all of Central America in on this for sure and probably most of South America. I think the point is that the status quo is a really bad deal for native born Americans. That's why Trump is winning.
Trump didn't say he would offer Mexico the opportunity to help pay for the wall if they so desired. He said he'd make them pay for it. I know Colombia was getting $1 billion/yr from the US for their phony war on drugs that they pretended to fight. You'd probably agree that was a waste of money, right? How much does Latin America get in foreign aid altogether per year?
And when the confederates saw Jackson standing fearless as a stone wall the army of Northern Virginia took courage and drove the federal army off their land.