Where Data Tells the Story
© Voronoi 2026. All rights reserved.
The United States has operated under divided government, where the president’s party does not control both chambers of Congress, for approximately 34 of the past 52 years.
Unified control occurred in just 18 of those years since 1975.
When the U.S. President’s party holds the majority in both chambers, it is considered a unified government.
This is based on historic data from the U.S. government archives.
For this visualization, we only tracked from the 94th through the 119th Congresses.
The current 119th Congress (2025-2027) represents unified Republican control under President Trump, his second separate unified period after 2017-2019. It makes him the only president in the dataset to regain unified government after losing it.