An infographic from The Economist shows which countries have constructed fences along their borders over history and why.
This week, Hungary completed construction of a fence along its Serbian border to keep out refugees trying to enter the European Union, a move that has sparked controversy worldwide. Opponents argue the fence not only shows a lack of compassion for people fleeing war and persecution, but that it also violates E.U. laws. On Wednesday, Hungarian police unleashed tear gas and pepper spray against hundreds of asylum-seekers trying to break through the fence.
