The gambit has triggered a national redistricting war, with governors of both parties threatening to initiate similar efforts in other states.

The effort is intended to help the G.O.P. win five more U.S. House seats in the midterm elections. Other states, red and blue, are likely to redraw their own maps.

Texas Democrats end walkout as GOP-controlled legislature prepares to vote on redistricting maps that could flip five congressional seats to Republicans