The constant flow of goods from Asia to the United States was briefly interrupted last month after Hanjin, the South Korean shipping line, filed for bankruptcy, stranding several dozen of its cargo ships on the high seas. It was a moment that made literal the stagnation of globalization. The growth of trade among nations is among the most consequential and controversial economic developments of recent decades. Yet despite the noisy debates, which have reached new heights during this presidential campaign, it is a little-noticed fact that trade is no longer rising. The volume of global trade was flat in the first quarter of 2016,