The United States Supreme Court has issued a landmark ruling that significantly weakens Section 2 of the 1965 Voting Rights Act, striking down a Louisiana congressional map that included two majority-Black districts and raising the legal bar for challenges to district boundaries that dilute minority voting power. The 6-3 decision, split along ideological lines, declared the Louisiana map an unconstitutional racial gerrymander — a ruling with far-reaching consequences for minority representation across the country ahead of November's midterm elections.

Section 2 of the Voting Rights Act, one of the key achievements of the American civil rights movement, had long prohibited any electoral practice or district map that resulted in diminished political opportunity for minority groups — even without proof of discriminatory intent. The court's conservative majority in Louisiana v. Callais effectively raised that threshold, requiring challengers to demonstrate deliberate racist intent behind how districts are drawn. In a sharp dissent, Justice Elena Kagan wrote that the ruling is the "latest chapter in the majority's now-completed demolition of the Voting Rights Act," warning it will "systematically dilute minority citizens' voting power." Civil rights organisations were swift to condemn the decision: the NAACP Legal Defense Fund called it a reversal of more than 60 years of civil rights protections, while the League of United Latin American Citizens described the Voting Rights Act as the "crown jewel of the civil rights movement" and said the ruling "breaks that promise."

President Donald Trump, who celebrated the outcome on his Truth Social platform as a "great victory for equal protection under the law," quickly signalled its political implications. He announced that Tennessee would redraw its congressional map, following a phone call with the state's Republican governor. Louisiana's governor, meanwhile, announced a delay to the state's primary elections to allow legislators to redraw the map under the new legal standard — a redraw expected to produce an additional Republican-leaning district. Florida's legislature also passed a new congressional map the same day, creating 24 districts expected to favour Republicans, up from 20. Georgia's Republican governor said he would review whether his state might also seek redistricting.

The ruling is the latest episode in a long and contested history of racial gerrymandering in the United States. The original Louisiana case dates to the 2020 Census, which showed Black residents making up roughly a third of the state's population, yet the Republican-controlled legislature initially maintained only one majority-Black district out of six. Two groups of Black voters sued, arguing this violated Section 2. A subsequent court-ordered redraw added a second majority-Black district — but that map was then challenged by white voters who argued that using race as a criterion in drawing districts violated the Constitution's equal protection clause, an argument the Supreme Court ultimately accepted. Political scientists note the practical effect: in a system where members of the House of Representatives are elected from single-member geographic districts drawn by state legislatures, the composition of those districts is decisive. Without majority-minority districts, minority candidates are rarely elected.

The decision is widely seen as accelerating a redistricting wave that has been building since last year, when Trump pressured Texas to redraw its maps. Analysts note that control of the House may rest on only a handful of seats, making the outcome of these remapped races consequential. Critics warn that the ruling effectively removes a critical federal guardrail against the kind of racially motivated district manipulation that has periodically marginalised Black and minority voters since the post-Civil War era of Reconstruction — a history Justice Kagan and others say the court's majority has chosen to ignore.