Israel is doing great with their wall. Now, I'm not a fan of what they're doing to the Palestinians, but if you seriously want a wall.... you can make it work.
Hams, that first part poses liberal stupidity. I know it's not you saying it, just you postulating what liberals will say; ie, "we need to take down the wall". But, quite frankly, therein lies the future of the United States. If that bitch mentality (pumping in illegals that will destroy the U.S.) persists, then the U.S. is done for.
It is ridiculously clear that in 30 to 40 years the Southwest of the United States will be overrun with the lowest of the low from Mexico. Gangs, crime, trash everywhere, the destruction of infrastructure, the loss of U.S. territory..... it will become a third-world region and simply be the garbage that all the Mexicans fled from. And after they have destroyed the Southwest, they will gravitate to whiter regions of economic prosperity; ie, instant replay of Mexicans fleeing Mexico to take over the Southwest.... it's then destroyed so they have to migrate to a new, healthy host.
Going around the Southwest I see armed guards (nice guns) at small stores, convenience stores, grocery stores, etc. I can tell you 100% that's because of the Mexicans.