A partisan redistricting battle among states has accelerated ahead of the November midterm elections following a US Supreme Court ruling that weakened the federal Voting Rights Act.
The decision opened the way for states to eliminate voting districts drawn for racial minorities.
An unusual spate of mid-decade redistricting has broken out after President Donald Trump urged Texas Republicans to reshape US House districts to give the party an edge.
Eight states have already adopted new House maps.
Republicans believe they could win up to 13 additional seats in Texas, Florida, Missouri, North Carolina, and Ohio.
Democrats, meanwhile, think they could gain up to 10 seats in California, Utah, and Virginia.
Midterm map battle
Historically, the president's party tends to lose seats in midterms, but Democrats need to gain only a few seats to wrest control of the House from Republicans.
In Texas, Republican Governor Greg Abbott has signed a revised map that could net five seats for the GOP, a move cleared by the Supreme Court for use this year.
Conversely, California voters have approved districts drawn by the Democratic-led Legislature that could help the party gain five seats.
In Florida, Governor Ron DeSantis signed revised districts on 4 May, aiming for four additional GOP seats, though court challenges contend the map violates state provisions against partisan favouritism.
In Louisiana, Governor Jeff Landry has postponed the primary to allow for revisions after the Supreme Court struck down a majority-Black district.
Meanwhile, Alabama officials hope to revert to a 2023 map to gain a seat, and in Tennessee, Governor Bill Lee has called for a special session to consider a map that could carve up a Black-majority district in Memphis.
Ohio has approved revised districts after a bipartisan panel vote, while Virginia voters backed a constitutional amendment that could help Democrats win four seats.
