The Supreme Court ruling that struck down Louisiana’s majority-Black 6th Congressional District — holding that the state had improperly used race as the predominant factor in drawing the district’s boundaries — marked a pivotal shift in the legal environment governing redistricting. The April 29 decision, combined with a separate Virginia Supreme Court ruling that tossed a Democrat-backed congressional map on state constitutional grounds, has given Republican lawmakers new leverage to redraw House districts in ways that could expand the party’s majority in the chamber.
The redistricting wave began last year when President Donald Trump urged Texas Republicans to redraw the state’s congressional map to improve the party’s odds in the midterms. Republican Gov. Greg Abbott signed a revised Texas map into law in August that party strategists believe could help the GOP flip as many as five Democratic-held seats. The U.S. Supreme Court cleared the Texas map for use in this year’s elections in December, and has since overturned a lower-court ruling that had blocked the districts as racially gerrymandered.
Democrats in California responded with their own political maneuvering. Voters there approved a Democratic-drawn congressional map in November that the party says could deliver five additional seats in the state’s 52-member delegation. The U.S. Supreme Court in February declined to block the map from being used in the midterms, rejecting an appeal from Republicans and the Department of Justice, which had argued the districts improperly favored Hispanic voters. A federal judge in Utah imposed revised House districts in November that could yield the state’s first Democratic House member, with both a federal appeals panel and the Utah Supreme Court rejecting Republican challenges to the court-drawn map in February.
Florida Gov. Ron DeSantis signed a revised congressional map on May 4 that Republicans estimate could help the party win four additional seats, reshaping districts in a state where Democrats currently hold eight of 28 House seats. The new map faces court challenges from opponents who argue it violates a provision of the state constitution that prohibits districts from being drawn with the intent to favor or disfavor a political party.
In Ohio, a bipartisan redistricting panel composed predominantly of Republicans voted in October to approve revised House districts that party strategists believe could flip two Democratic-held seats. The state constitution required new districts ahead of the 2026 election because Republicans had enacted the prior map without sufficient Democratic support after the most recent census.
Tennessee Gov. Bill Lee signed new House districts on May 7 that carve up the state’s lone Democratic-held seat — a Black-majority district encompassing Memphis — in a move Republicans believe could give the party an additional seat. Court challenges contend the new map was drawn with a racially discriminatory purpose and that Lee exceeded the scope of his special session proclamation.
North Carolina’s Republican-led General Assembly gave final approval in October to revised districts that could help Republicans pick up an additional seat in the 14-member delegation. A federal court panel in November declined to block the map from being used in the midterm elections. In Missouri, Republican Gov. Mike Kehoe signed a map in September that reshapes the Kansas City-based district held by a Democrat, potentially delivering the GOP an additional seat. The Missouri Supreme Court ruled on May 12 that the map remains in effect while election officials evaluate a referendum petition seeking to put the issue to a statewide vote.
In Alabama, the U.S. Supreme Court on May 11 cleared the state to use a congressional map passed by Republican lawmakers in 2023 that the party believes could help it win an additional seat. Attorneys who originally challenged the map have asked a lower court to block it again. The combined tally of Republican gains from enacted maps in Texas, Florida, Ohio, Tennessee, North Carolina, Missouri, and Alabama accounts for the GOP’s estimate of up to 15 additional seats, though the party’s projections assume past voting patterns hold in November.
Two Southern states are still actively considering new maps. In Louisiana, Republican lawmakers proposed a revised congressional map after the Supreme Court’s April 29 ruling that could help the GOP pick up an additional seat in the state’s six-member delegation. Republican Gov. Jeff Landry postponed the state’s May congressional primary to either July 15 or a date set by lawmakers, a move challenged in court by opponents who argue Landry lacked the authority to suspend the elections.
In South Carolina, Republican state House members have advanced a proposal that could give the GOP a stronger chance at flipping the state’s single Democratic-held seat. The House voted to permit redistricting to be considered after the regular legislative session ended May 14, but the resolution failed to secure the required two-thirds majority in the Senate, leaving the proposal’s path forward uncertain.
The unusual wave of mid-decade redistricting — legislative maps are typically redrawn once per decade after the census — has scrambled the electoral landscape months before voters cast ballots in November. Democrats need a net gain of just a few seats to seize control of the House, which would give the party subpoena power and the ability to block Trump’s legislative priorities. Historically, the president’s party tends to lose seats in midterm elections, a pattern that could either blunt or amplify the effects of the new maps depending on turnout and the national political environment.