During which era did the Progressive Era reforms take place?

The Progressive Era reforms took place primarily between the 1890s and the 1920s. This time frame is characterized by a widespread movement across the United States aimed at addressing the social issues that arose from rapid industrialization, urbanization, and political corruption. Reformers sought to improve society through various initiatives, such as labor reforms, women's suffrage, temperance, and antitrust laws.

During this period, notable figures like Theodore Roosevelt and Woodrow Wilson championed reforms that aimed to regulate industries, improve working conditions, and expand democratic participation. The government also saw the implementation of policies intended to reduce corruption and increase accountability, such as the direct election of senators and the establishment of regulatory agencies. This era resulted in significant legislative changes that shaped modern American society, making the time span from the 1890s to the 1920s a pivotal moment in U.S. history for reform movements.

The other time periods listed do not correspond to the Progressive Era's defining characteristics or the major reforms associated with it. The late 19th century and early 20th century uniquely align with the goals and achievements of the Progressive movement.