In 1915, western farmers mounted one of the most significant challenges to party politics America has seen: the Nonpartisan League, which sought to empower citizens and restrain corporate influence. Before its collapse in the 1920s, the League counted over 250,000 paying members, spread to thirteen states and two Canadian provinces, controlled North Dakota's state government, and birthed new farmer-labor alliances. Yet today it is all but forgotten, neglected even by scholars.

Michael J. Lansing aims to change that. Insurgent Democracy offers a new look at the Nonpartisan League...