"Texas Republicans, at the urging of President Donald Trump, have redrawn their state’s congressional districts to give the GOP an advantage in next year’s midterm elections. The effort has led to a countermove by California to redraw its districts to give Democrats an edge. Several other states reportedly are considering similar moves.

Midcycle redistricting efforts like the ones in Texas and California have, up to now, been extremely uncommon. Since 1970, only two states – Texas in 2003 and this year, and Georgia in 2005 – have voluntarily redrawn their congressional maps between censuses for partisan advantage, according to a new Pew Research Center analysis."