What effect did U.S. intervention in the Great War have on the progressive era and reforms?
The progressive era was a period between 1890s to 1920s characterized with widespread political reforms and social activism across the United States. The United States involvement in the great war impacted various changes at the national level including the direct election of senators alongside the Seventeenth Amendment, imposition of the income tax with the Sixteenth Amendment. Also, the involvement facilitated election reforms to hinder fraud and corruption, and prohibition with the Eighteenth Amendment. Therefore, all these reforms increased political authority for many citizens.