US National Archives
Nara: Treasures of Congress: Progressive Reform: Direct Election of Senators
Check out this amazing interactive site that shows you primary documents outlining the 17th amendment proposal (click on any document) for popular election of senators, provided by the National Archives and Records Administration (NARA).
Other
Woodrow Wilson Presidential Library: 1916 Election
Here is a multi-faceted look at the election of 1916. Read about the politics of the Democratic and Republican Parties and the results of the election. Also, find out about the interests of immigrants, women, African-Americans, and...
US Department of State
American Life: Discontent and Reform
This article from the US Department of State, "USA History in Brief," reviews the reasons for and results of Progressivism in the early 20th century.
Independence Hall Association
U.s. History: The Election of 1912
William Howard Taft was a disappointment to the progressive-minded Theodore Roosevelt. Read about how he tried to be the Republican Party candidate in 1912, and when that failed, he started a third party, the platform of which was filled...
Independence Hall Association
U.s. History: Passing the Torch
See how William Howard Taft, Theodore Roosevelt's handpicked successor, qualifies as one of the progressive presidents, but infuriated progressives because of some of his policies.
Khan Academy
Khan Academy: Ap Us History: 1890 1945: The Age of Empire: The Progressive Era
The Progressive Era from the 1890s to the 1920s evolved as a response to the negative effects of industrialization. Reforms that emerged provided protections for workers and consumers and gave women voting rights. Backlash against the...
Encyclopedia Britannica
Encyclopedia Britannica: 300 Women Who Changed History: Victoria Woodhull
Encyclopaedia Britannica provides a biography of Victoria Claflin Woodhull (1838-1927), who supported many progressive issues, including woman suffrage.
Ohio History Central
Ohio History Central: Federal Reserve Act
A brief description of the creation of the Federal Reserve, a banking system that established twelve district banks across the nation.