The post-war goal of globalized free trade, so critical to sustaining international cooperation and economic growth, is in big trouble. Most trade deals done these days are bilateral or multilateral arrangements driven by narrow political objectives as much as broad economic ones. Both candidates for the U.S. presidency are advocating protectionism. The Brexit vote was partly a rejection of open borders. But the ideal of free and fair global trade can be salvaged, writes Carter Vance, if trade-dependent countries like Canada take up the cause of reviving the near-moribund World Trade Organization.