How were the progressive era reforms a reaction to the problems of gilded age? (political, economic, social)

The Progressive Era was a period of widespread social activism and political reform across the United States, from the 1890s to the 1920s.[1] The main objectives of the Progressive movement were eliminating problems caused by industrialization, urbanization, immigration, and corruption in government.

the correct answer is a

continental currency was denominated in dollars from $​1⁄6 to $80, including many odd denominations in between.