MartinVanCreveld :

"Never" is too much of a word. Nothing lasts forever. But history proves that walls work. The Roman wall – the Limus(?) – worked for hundreds of years... the GreatChineseWall worked, not forever, but for hundreds of years... the wall in Korea has been working for fity years... the wall between Turks and Greeks in Cyprus is working.... the Berlin Wall worked beautifully.... Unfortunately, the Israeli army insists against all military logic on being present on both sides of the wall. We could formally finish the problem at least in Gaza, in 48 hours, by getting out and building a proper wall. And then of course, if anybody tries to climb over the wall we kill him.

America's wall goes up :