**Several states adopted new congressional maps for the 2026 midterms through mid-decade redistricting, driven primarily by Republican-led efforts after President Trump urged changes in summer 2025 and the Supreme Court’s April 2026 decision in Louisiana v. Callais limited Voting Rights Act challenges to partisan gerrymanders.** New maps are in effect in Alabama, California, Florida, Louisiana, North Carolina, Ohio, Tennessee, Texas, and Utah, with most expected to favor Republicans except in California and Utah. These followed special legislative sessions, ballot measures, or court orders, shifting roughly a net of 8–12 seats toward Republicans overall while Democrats countered in California via Proposition 50. Missouri’s new map was blocked for 2026 by the Supreme Court (old lines apply, with a future referendum), Virginia’s attempt failed on procedural grounds, and other states saw unsuccessful pushes. Ongoing litigation in multiple states, including Texas and Florida, could still alter boundaries before November 3, though primaries have already occurred under the new lines in several places. Trader focus centers on which states’ maps survive legal challenges and deliver the intended partisan shifts in House races.