Ten states—Alabama, California, Florida, Louisiana, Missouri, North Carolina, Ohio, Tennessee, Texas, and Utah—have enacted revised congressional maps through legislative action or ballot measures since mid-2025, making them effective for the 2026 midterms. These mid-decade changes, uncommon since the 1800s, stem primarily from partisan efforts to adjust district lines for House seat gains, accelerated by the Supreme Court’s 2026 Louisiana v. Callais ruling that altered Voting Rights Act standards for racial considerations in redistricting. Most other states retain post-2020 census maps, though litigation continues in several jurisdictions and candidate filing deadlines have shifted in places like Florida. Special primaries in affected districts are scheduled for August 2026. Trader sentiment reflects the finality of these enactments and any remaining court challenges that could alter boundaries before November voting.