Mid-decade congressional redistricting has accelerated ahead of the 2026 midterms due to Republican-led legislative efforts in multiple states, often following special sessions, and Democratic responses such as California's voter-approved ballot measure. A key catalyst was the U.S. Supreme Court's 2026 rulings, including Louisiana v. Callais, which altered standards for racial gerrymandering claims under the Voting Rights Act and enabled map revisions in states like Alabama, Louisiana, and Tennessee. Ten states—Alabama, California, Florida, Louisiana, Missouri, North Carolina, Ohio, Tennessee, Texas, and Utah—have enacted new maps, with changes typically favoring the party controlling the legislature. Ongoing litigation in several jurisdictions and scheduled primaries or general elections under the revised lines continue to shape which maps reach voters in November.