Every ten years our entire country redraws their state legislature and U.S. congressional districts based on the results of the U.S. Census.
In Arizona, a critical swing state which will likely be gaining an additional congressional seat, the process is controlled by an Independent Redistricting Commission. The commission has two Republicans, two Democrats, and one Independent member who control the map making process.
Unfortunately, the commission violated the Arizona State Constitution when it drew the most recent set of maps. Arizona went from having five Republican and three Democrat congressional seats before the 2010 redistricting, to four Republican and five Democrat seats after.
That swing was only possible because the commission violated the Arizona State Constitution and created districts that split apart cities, counties, and communities of interest!