Walls work!

Seth Barron writes in City Journal,

...But what evidence is there that walls—for millennia the most basic unit of construction and defense—are ineffective? A wall, or fence, runs along much of the border near population centers like San Diego and El Paso, and these barriers appear to work, to the extent that a partial wall can be said to work. A 440-mile wall separates Israel from the West Bank; it has dramatically reduced terrorism. Saudi Arabia has a wall on its border with Yemen and has begun construction of a wall on its Iraq border, too. Hungary, Russia, Lithuania, and Slovenia have built border walls. Belfast and Derry have “peace lines” (walls) separating Catholic from Protestant neighborhoods. The 1,800-mile, impermeable India-Pakistan border is visible at night from space because 150,000 floodlights light it. The United States maintains 25,000 soldiers in South Korea to preserve the integrity of the fence dividing the Korean peninsula.

Read more here.