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Payne-Aldrich tariff

The Payne-Aldrich tariff of 1909 reduced the United States tariff rate to 37%. As President William Howard Taft had requested more reduction, this tariff split the Republican party into Progressives and Old Guard.

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Quadratic formula

... term b2 – 4ac is called the discriminant of the quadratic equation, because it discriminates between three qualitatively different ...