The Age of Walls: How Barriers Between Nations Are Changing Our World

The globe has always been a world of walls, from the Great Wall of China to Hadrian's Wall to the Berlin Wall. But a new age of isolationism and economic nationalism is upon us, visible not just in Trump's obsession with building a wall on the Mexico border or in Britain's Brexit vote but in many other places as well. China has the great Firewall, holding back Western culture. Europe's countries are walling themselves against immigrants, terrorism, and currency issues. South Africa has heav...