Ten states—Alabama, California, Florida, Louisiana, Missouri, North Carolina, Ohio, Tennessee, Texas, and Utah—have enacted new congressional maps since mid-2025, marking an unusually active round of mid-decade redistricting ahead of the 2026 midterms. These changes stem primarily from state legislative actions, a November 2025 California ballot measure, and federal court rulings including the Supreme Court’s Louisiana v. Callais decision, which altered standards for evaluating race in districting and enabled reversals of prior injunctions. Partisan map-drawing in Republican-led states and responses to Voting Rights Act litigation have produced expected seat shifts favoring one party or the other in most cases, while a handful of additional states explored but did not complete changes before the election cycle. Most maps are now finalized or in effect for primaries and the November 2026 contests, though residual litigation in a few jurisdictions could still trigger adjustments before ballots are fully settled.