**Mid-decade congressional redistricting for the 2026 midterms stems from an unusual wave of map changes outside the standard post-census cycle.** President Trump urged Texas Republicans in 2025 to redraw lines for partisan advantage, prompting similar voluntary or litigation-driven efforts in other Republican-led states and a Democratic counter-move in California. The U.S. Supreme Court’s April 2026 ruling in *Louisiana v. Callais* eased Voting Rights Act constraints on majority-minority districts, accelerating redraws in states including Alabama, Louisiana, Tennessee, and Florida. As of early September 2026, ten states enacted new maps projected to net Republicans roughly a dozen seats overall and Democrats several in California: Alabama, California, Florida, Louisiana, North Carolina, Ohio, Tennessee, Texas, and Utah. Missouri’s new map, used in August primaries, was blocked by the state supreme court and upheld by the U.S. Supreme Court in mid-September, returning the state to 2022 lines for the general election. Most changes followed legislative passage, voter approval, or court clearance, with limited remaining litigation or referendums unlikely to alter November outcomes in other states. Key upcoming factors include any final ballot printing deadlines and unresolved procedural disputes.