Mid-decade congressional redistricting has accelerated ahead of the 2026 House elections, with ten states—Alabama, California, Florida, Louisiana, Missouri, North Carolina, Ohio, Tennessee, Texas, and Utah—enacting revised maps since summer 2025. These changes stem from voluntary legislative actions in partisan-controlled states, responses to prior Voting Rights Act litigation, and a U.S. Supreme Court ruling in Louisiana v. Callais that altered standards for evaluating race in districting. Several maps were finalized in spring and summer 2026, shifting candidate filing deadlines and primary timelines in affected states. Additional states considered but did not complete changes, while ongoing court challenges and potential referendums could still alter implementation before November. Traders track these legislative sessions, judicial rulings, and state-specific procedural hurdles as the primary drivers of which maps reach voters.