McKinley Tariff
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The McKinley tariff of 1890 was what set the average ad valorem tariff rate for imports to the United States at 50%, and protected agriculture. Its chief proponent was Congressman and future President William McKinley. In return for its passage, the Sherman Silver Purchase Act was given Republican support. It raised the prices in the United States under Benjamin Harrison and hurt the common folk, which may have cost him his presidency in the next elections.