Thornburg v. Gingles
The Court upheld a lower court's finding that five multimember state legislative districts in North Carolina diluted black voters' ability to elect their preferred candidates, violating Section 2 of the Voting Rights Act, but reversed as to one district where black candidates had won consistently for over a decade.
The decision lays out, for the first time, the legal test for proving this kind of vote dilution claim -- requiring a minority group to show it is large and compact enough to form its own district, that it votes cohesively, and that the white majority usually votes as a bloc to defeat its preferred candidates.
“Multimember districts and at-large election schemes, however, are not per se violative of minority voters’ rights.”
The Court clarifies that multimember districts are not automatically unlawful under the Voting Rights Act.
How it got here: A three-judge federal district court found the districting scheme violated the Voting Rights Act; North Carolina officials took a direct appeal to the Supreme Court.
The Case in Depth
What happened
In 1982 North Carolina's legislature redrew state Senate and House districts. Black registered voters sued, arguing that combining several counties into multimember districts (where voters elect multiple representatives at once) diluted Black voting strength and made it harder to elect candidates of their choice, violating federal voting-rights law and the Constitution.
The question before the Court
Could black voters in North Carolina prove that multimember state legislative districts made it harder for them to elect the candidates they preferred, in violation of the Voting Rights Act?
The Court's answer
Partly -- the Court ruled that black voters could show unlawful vote dilution in five of the six multimember districts they challenged, because they proved black residents were numerous and geographically concentrated enough to form their own district, voted cohesively, and were usually outvoted by a white bloc that defeated their preferred candidates. The Court laid out these three requirements as the standard test going forward for this kind of Voting Rights Act claim.
In one district, however, black candidates had won consistently in every election for over a decade, achieving roughly proportional representation. The Court found that sustained pattern of success was strong enough evidence that voters there did not have less opportunity to elect their chosen candidates, so it reversed the lower court's finding of a violation in that single district.
Curious how the Court got there? See the step-by-step legal reasoning →
Why it matters
This ruling gave voters, civil rights groups, and state officials a concrete roadmap for challenging or defending election maps across the country. It shaped how legislatures draw districts to avoid diluting minority votes and became the primary legal tool used for decades afterward in redistricting fights over the ability of Black, Latino, and other minority voters to elect their chosen candidates.
What changes now
The ruling is a final decision on the merits. North Carolina's multimember districting scheme was invalidated as to five districts, meaning those districts had to be redrawn consistent with the Court's new three-part test for proving vote dilution. The one district with a sustained record of Black electoral success was found not to violate the law, and the Court reversed that portion of the trial court's judgment outright rather than sending it back for further proceedings.
What this does not decide
The Court expressly left open how its test would apply to claims that districting merely reduces a minority group's ability to influence (rather than elect) representatives, and it did not decide whether courts must always use a hypothetical majority-minority single-member district as the baseline for measuring diluted voting strength in every case.
Concurrences and dissents
How the Justices voted
Majority (1). Justice Brennan (author).
Separate writings (3). Justice White (author of a concurrence).
Concurrence — Justice White
Justice White joined most of the majority opinion but rejected the portion holding that only the race of the voter -- never the race of the candidate -- matters in identifying racially polarized voting. He argued that ignoring candidates' race risks turning the inquiry into ordinary interest-group politics rather than a check on racial discrimination, though he agreed with the outcome in this case. Read the full concurrence →
Concurrence — Justice O'Connor
Justice O'Connor, joined by three other justices, agreed with the outcome but not the reasoning. She argued the majority's test for measuring diluted voting strength -- based on hypothetical majority-minority districts -- effectively creates a right to roughly proportional representation for cohesive minority groups, which she said conflicts with Congress's express rejection of a proportional-representation guarantee. Read the full concurrence →
Dissent in part — Justice Stevens
“Even under the Court’s analysis, the decision simply to reverse — without a remand — is mystifying.”Stevens objects to the majority reversing the ruling on House District 23 without sending it back for further proceedings.
Justice Stevens, joined by two others, agreed with the Court's reasoning and result everywhere except as to House District 23. He argued the trial court's findings about that district were adequately supported by the record and did not deserve to be reversed outright, criticizing the majority for reversing without a remand and without letting the challengers respond to the new legal standard.
How the Court got there
The legal reasoning, step by step
- The Court explained that Congress had rewritten Section 2 of the Voting Rights Act in 1982 to require only proof of discriminatory effect -- a 'results test' -- rather than proof that officials intentionally discriminated, rejecting the intent requirement a prior Supreme Court decision had imposed.
- To decide when multimember districts unlawfully weaken a minority group's voting power, the Court set out three threshold requirements: the minority group must be large and geographically compact enough to form a majority in its own single-member district, its members must vote cohesively for the same candidates, and the white majority must vote as a bloc strongly enough to usually defeat the minority's preferred candidates.
- The Court defined 'racially polarized voting' -- where different races consistently support different candidates -- as measured only by whether voting patterns correlate with race, holding that the underlying reasons for that correlation (such as income or education differences) do not matter and cannot be used to disprove the pattern.
- Applying the clearly-erroneous standard of review, meaning appellate courts should defer heavily to a trial court's fact-based findings unless a clear mistake is shown, the Court found the trial court's conclusions about racial bloc voting and vote dilution in six of the seven districts were adequately supported by the evidence.
- The Court held that occasional election of minority candidates does not automatically defeat a vote-dilution claim, but concluded that one district's sustained, proportional record of electing Black representatives over six straight elections was strong enough evidence that the trial court erred in finding a violation there.
Doctrinal impact
Cases affected by this decision
Abrogates Mobile v. Bolden (446 U. S. 55)
Its requirement that voters prove intentional discrimination is replaced by the amended law's results-based test.
Reaffirms White v. Regester (412 U. S. 755)
The Court relies on this case's 'results test' as the controlling standard Congress meant to restore.
Reaffirms Whitcomb v. Chavis (403 U. S. 124)
The Court treats this decision, requiring more than lack of proportional representation, as still good law.