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Walls are going up. Nationalism and identity politics are on the rise once more. Thousands of miles of fences and barriers have been erected in the past ten years, and they are redefining our political landscape. ; There are many reasons why we erect walls, because we are divided in many ways: wealth, race, religion, politics. In Europe the ruptures of the past decade threaten not only European unity, but in some countries liberal democracy itself. In China, the Party's need to contain the divis |