The United States is entering a period of profound uncertainty in the world political economy--an uncertainty which is threatening the liberal economic order that its own statesmen created at the end of the Second World War. The storm surrounding this threat has been ignited by an issue that has divided Americans since the nation's founding: international trade. Is America better off under a liberal trade regime, or would protectionism be more beneficial? The issue divided Alexander Hamilton from Thomas Jefferson, the agrarian south from the industrializing north, and progressives from robber barons in the Gilded Age. In our own times, it has pitted anti-globalization activists and manufacturing workers against both multinational firms and the bulk of the economics profession.

Ambass...