We document the outbreak of a trade war after the U.S. adopted the Smoot-Hawley tariff in June 1930. U.S. trade partners initially protested the possible implementation of the sweeping tariff legislation, with many eventually choosing to retaliate by increasing their tariffs on imports from the...

During much of the previous era of globalization, from the 1860s until the First World War, U. S. tariffs were surprisingly high. Present-day economic historians have suggested that U. S. protection as the result of a backlash against globalization that was the beginning of its decline. They...