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...

International trade became much less multilateral during the 1930s. Previous studies, looking at aggregate trade flows, have argued that discriminatory trade policies had comparatively little to do with this. Using highly disaggregated information on the UK's imports and trade policies, we find...