Walls

Trump says the wall will work and democrats say it will not and neither side knows for sure. There is some evidence that walls work but no evidence that they don't work. Israel is most commonly used as an example of a wall that works but there are others. Today, as President Trump pushes his campaign promise to build a wall on the border with Mexico, there are at least 77 walls or fences around the world — many erected after the Sept. 11, 2001, terrorist attacks in New York City and at the Pentagon.