The Smoot-Hawley Tariff Act of 1930 had significant and detrimental impacts on the U.S. economy during the Great Depression.
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Retaliatory Tariffs: The United States imposed high tariffs on imported goods in an effort to protect domestic industries. In retaliation, other countries raised their own tariffs on American exports, leading to a steep decline in international trade. This created a vicious cycle that further harmed the U.S. economy by limiting market access for American goods and exacerbating the economic downturn.
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Unemployment and Production: As trade collapsed and businesses faced reduced demand, unemployment soared to unprecedented levels, reaching around 25 percent. This decrease in employment and income led to a significant decline in overall production, contributing to the economic strife experienced during the Great Depression.
In summary, the Smoot-Hawley Tariff exacerbated the Great Depression by prompting retaliatory tariffs from other nations and significantly increasing unemployment and decreasing industrial production in the United States.