Republican-led legislatures in six states — Texas, Florida, Louisiana, Alabama, Tennessee and North Carolina — have redrawn congressional maps mid-decade in ways that break up predominantly Black communities, following a Supreme Court ruling that weakened Voting Rights Act protections and a push by President Trump for states to redistrict in the GOP's favour ahead of the midterms. The changes reduce the political influence of Black voters, who backed Kamala Harris by around 78% in these states in 2024, by diluting once-cohesive districts into ones with far smaller Black populations, often merged with strongly Republican areas.

Examples include Tennessee's 9th District, previously 62% Black and centred on Memphis, now split into three districts each under 30% Black; Louisiana's elimination of one of its two Black-majority districts, absorbing Democratic-leaning Shreveport into a mostly Republican, less-than-a-third-Black region; and Alabama's removal of a majority-Black district, splitting Mobile and Montgomery between districts only 27-42% Black. Florida's 20th District dropped from 53% to 45% Black, Texas forced two Black Democratic incumbents into a primary runoff after redrawing Houston-area seats, and North Carolina's 1st District fell from 42% to 34% Black. The Supreme Court's late-April ruling, which struck down Louisiana's map as an "unconstitutional racial gerrymander," paved the way for these revisions; Alabama's own 2023 map was found discriminatory by a lower court but was allowed to stand after Supreme Court approval.