Widespread Partisan Gerrymandering Mostly Cancels Nationally, but Reduces Electoral Competition

Understand

Congressional district lines in many U.S.

• states are drawn by partisan actors, raising concerns about gerrymandering.
• To separate the partisan effects of redistricting from the effects of other factors including geography and redistricting rules, we compare possible party compositions of the U.S.
• House under the enacted plan to those under a set of alternative simulated plans that serve as a non-partisan baseline.