In the year 2000, Arizona voters approved a ballot initiative known as Proposition 106 that amended the Arizona state constitution wherein an independent commission was created to draw district lines, instead of leaving it in the hands of the state legislature (Redistricting in Arizona). This commission, known as the Arizona Independent Redistricting Commission, was mandated to produce districts “roughly equal in population,” and that “the federal Voting Rights Act, district shape, geographical features, respect for communities of interest and potential competitiveness” should also be considered.

Proposition 106 was challenged by the Arizona legislature for its constitutionality, making it all the way to the U.S. Supreme Court. The Supreme Court upheld the proposition, and the Arizona Independent Redistricting Commission remains to this day. The result has been sensible district lines.