I am familiar with the dates. The Crash of 1929 took down financial markets. The tariff war ensured that the panic would become a full-blown depression lasting a decade. and starting after the international trade war. Thanks for the correction, but Smoot-Hawley and the Crash together started the international depression, along with punitive war reparations demanded by Europe after the Treaty of Versailles, which beggared Germany and opened the door for Hitler. Smoot-Hawley's exact date doesn't matter, only its precedence of the Great Depression.