Supreme Court of US Affirms Independent Arizona Commission to Set Congressional Boundaries

[From article]
The case challenged a state constitutional amendment adopted in 2000 by Arizona voters which created a politically neutral commission drawing new boundaries for the state’s congressional districts every ten years. Before the amendment, the state legislature, as in many states, had been responsible for setting and adjusting district lines.
[. . .]
Affirming the district court’s decision, the Supreme Court also rejected the Arizona legislature’s “wooden” interpretation of the Election Clause. In doing so, the Court preserved a valuable tool used by citizens across the country to reform redistricting practices.
[. . .]
Efforts to adopt similar sorts of reforms are currently underway in Illinois, Ohio, and South Dakota – with Arizona and California frequently serving as models for proposed reforms.

https://www.brennancenter.org/legal-work/arizona-state-legislature-v-arizona-independent-redistricting-commission

Arizona State Legislature v. Arizona Independent Redistricting Commission (Amicus Brief)
June 29, 2015