The Progressive Era covers the period of widespread social, economic, and political reform in the United States, spanning the late nineteenth and early twentieth century, ending when the United States enters World War I.
Possible sub-topics could include:
The Oxford Encyclopedia of American Business, Labor, and Economic History by 
Encyclopedia of the Gilded Age and Progressive Era by 
Historical Dictionary of the Progressive Era, 1890-1920 by Want to find more books on the Progressive Era?
Browse our collection of books with the following call numbers:
America in the Age of the Titans by 
Children and Youth During the Gilded Age and Progressive Era by 
A Companion to the Gilded Age and Progressive Era by 
