Louisiana lawmakers passed a new congressional map Friday that eliminates one of the state's two majority-Black districts, potentially allowing Republicans to gain an additional seat in the U.S. House of Representatives.

The new map was approved following a U.S. Supreme Court ruling in April that struck down the state's current congressional map as an illegal racial gerrymander. The court's decision weakened protections under the 1965 Voting Rights Act and prompted a rush by Republican-controlled Southern states to redraw their districts.

Under the new map, Louisiana will have only one majority-Black district instead of two. The map redraws Democratic Rep. Cleo Fields' district, clustering it around predominantly white communities in the Baton Rouge area and southern Louisiana. It also adds part of Baton Rouge to the heavily Democratic, majority-Black district based in New Orleans currently represented by Democratic Rep. Troy Carter.

Republican Gov. Jeff Landry is expected to sign the new map into law. The redistricting forced Landry to postpone the state's U.S. House primary, originally scheduled for May 16, until later this summer to allow time for the new map to be drawn and approved.

Republicans currently hold four of Louisiana's six congressional seats. The new map is designed to give the party a chance to win five of the six seats, though Republicans considered but ultimately rejected drawing a map that could have given them all six seats.

Several other Southern states have also moved to redraw their congressional maps following the Supreme Court ruling. Florida, Tennessee, and Alabama have all taken steps to alter their districts, with Republicans hoping to gain as many as 14 seats nationwide through redistricting efforts. Additional legal challenges to the new Louisiana map are expected.