California uses a voter-established independent redistricting commission to draw congressional district maps after the decennial U.S. Census.
November 03, 2025
high
general
Describes California's institutional approach to drawing congressional maps.
California voters approved constitutional amendments in 2008 and 2010 that removed the power to draw state legislative and congressional district boundaries from politicians and placed that authority with an independent redistricting commission.
October 06, 2025
high
institutional
Describes the structural change to how district maps are drawn in California.
In 2020, more than two-thirds of Virginia voters approved a constitutional amendment establishing an independent redistricting commission to draw decennial legislative maps.
November 03, 2020
high
temporal
State-level ballot measure that created an independent commission for drawing legislative districts on the decennial redistricting cycle.
In 2020, California voters removed the state legislature's authority to draw legislative and congressional district maps and established an independent redistricting commission.
January 01, 2020
high
temporal
State-level change to redistricting authority implemented via ballot measure in California.
California voters approved a 2010 ballot measure that expanded the independent redistricting commission's authority to include congressional district maps.
November 02, 2010
high
temporal
The 2010 measure extended the commission's role to congressional as well as state legislative redistricting.
California voters approved the creation of an independent redistricting commission via a 2008 ballot measure.
November 04, 2008
high
temporal
The commission was created to remove direct legislative control over drawing district lines.