Bangladesh, July 27 -- The latest expansion of US Section 301 tariffs marks another turning point in the evolution of global trade policy. By extending broad-based tariffs to dozens of trading partners and covering nearly all imports entering the United States, Washington has signaled that trade protection has become a more enduring feature of its economic strategy rather than a temporary negotiating tool. Whether viewed as an effort to protect domestic industries, reduce trade imbalances or strengthen national security, the decision introduces fresh uncertainty into an already fragile global economy.

The new tariff framework applies different rates to a wide range of economies, including close US allies as well as strategic competitors....