The age of walls : how barriers between nations are changing our world

"Tim Marshall ... analyzes the most urgent and tenacious topics in global politics and international relations by examining the borders, walls, and boundaries that divide countries and their populations. 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 Me...