For nearly half a century, part of the Voting Rights Act worked like a constitutional alarm system. Certain states and local governments could not change their election rules until the federal government checked the change first.
That requirement was called preclearance, and it did not apply nationwide. It applied to jurisdictions flagged by a mathematical trigger in the law itself. In Shelby County v. Holder (2013), the Supreme Court did not strike down preclearance by name. Instead, it struck down the trigger.
The result was functionally the same: preclearance stopped, because there was no longer a valid way to determine who had to do it.
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What preclearance was in plain terms
Preclearance was the Voting Rights Act’s most aggressive enforcement tool. Under Section 5, covered jurisdictions had to get federal approval before implementing many election related changes.
Think of it like this: instead of voters challenging a new rule after it was already in effect, the burden was on the government to prove the rule was not discriminatory in advance.
What kinds of changes needed approval
Preclearance covered a wide range of election administration decisions, including changes that can sound technical but have huge real world impact:
- Redrawing election district lines and local maps
- Moving polling locations or changing voting hours
- Changing voter registration procedures
- Altering methods of election, such as switching to at large voting
- Adopting new voting rules or requirements that affect access
Jurisdictions could seek preclearance either from the U.S. Department of Justice or from a special three judge federal court in Washington, D.C.
Section 4(b): the coverage formula that made Section 5 work
Section 5 did not apply to every state. It applied only to jurisdictions captured by Section 4(b), known as the coverage formula.
Section 4(b) used historical data, including whether a jurisdiction used tests or devices tied to voting and whether voter turnout or registration levels fell below certain thresholds, based on elections in the 1960s and early 1970s.
The point was blunt and practical. Congress identified places where racial discrimination in voting had been both persistent and inventive, then required those places to clear changes ahead of time because after the fact lawsuits were not stopping the damage quickly enough.
What Shelby County challenged
Shelby County is in Alabama, a state covered by the Section 4(b) formula at the time. The county argued that the preclearance regime was no longer justified by current conditions and that it intruded on state sovereignty over elections.
The legal target was not only Section 5’s concept of advance federal permission. It was the idea that Congress could keep using an old formula to decide, decades later, which states and localities carried that extra federal burden.
The holding: Section 4(b) is unconstitutional
In a 5 to 4 decision, the Supreme Court held that Section 4(b)’s coverage formula was unconstitutional. Chief Justice Roberts wrote that the formula relied on outdated data and did not reflect current conditions.
The Court’s core idea was this: the Voting Rights Act had been justified by exceptional circumstances, but the statute still treated states differently based on a decades old snapshot. In the majority’s view, that mismatch violated principles of equal sovereignty among the states and exceeded what was appropriate under modern conditions.
What the Court did not do
The Court did not strike down Section 5 itself. The preclearance mechanism remained in the U.S. Code.
But Section 5 depends on Section 4(b) to identify who must preclear. Once the coverage formula fell, there were no jurisdictions left that could be automatically required to preclear under the old system.
That is why people often say Shelby County “ended preclearance.” The Court removed the key that turned the lock.
What changed after 2013
Before 2013, covered jurisdictions had to clear many election changes in advance. After Shelby County, they generally did not.
Practical effects
- The default flipped. Instead of “get permission first,” the system became “implement first, then defend later if sued.”
- Litigation became reactive. Challengers often must prove a violation after a law takes effect, which can be slow and expensive.
- Federal review became narrower. Without a coverage formula, DOJ could not run the same front end screening across covered states and counties.
This is a major procedural shift. Preclearance was not just about whether a rule was legal in the abstract. It was about timing. It tried to prevent discriminatory changes from shaping an election before courts could respond.
What stayed in place in the Voting Rights Act
Shelby County did not erase the Voting Rights Act. It narrowed one of its enforcement engines.
Section 2 still applies nationwide
Section 2 remains the Act’s broad, nationwide ban on voting practices that discriminate on the basis of race, color, or language minority status.
But Section 2 is typically enforced through lawsuits brought after the fact. That is powerful, but it is not the same as preclearance’s requirement to prove fairness before implementation.
Preclearance can still happen through “bail in”
Even after Shelby County, courts can place jurisdictions under preclearance through a process sometimes called bail in, tied to Section 3(c) of the Act, when a court finds certain constitutional violations. That path exists, but it is case specific and requires litigation first.
What disappeared in 2013 was the automatic, formula based map of who had to preclear.
The constitutional tension underneath the case
Shelby County sits at the intersection of two constitutional commitments that regularly collide.
- Congress’s power to enforce the Reconstruction Amendments, especially the Fifteenth Amendment’s command that the right to vote cannot be denied or abridged on account of race.
- State control over elections, and the broader federalism instinct that states should be treated as equal sovereigns unless Congress can justify a departure.
The majority believed the Voting Rights Act’s extraordinary remedy needed an updated justification and a modern coverage formula. The dissent argued that Congress had built a record showing continued discrimination and that it was Congress, not the Court, that should decide how to enforce the Fifteenth Amendment.
This is one reason Shelby County continues to matter. It is not only a voting rights decision. It is also a case about who gets to decide when an emergency has ended.
Where to read more
If you want the full structure of the Act and its major provisions, start with our broader overview: Voting Rights Act. This page focuses on the preclearance system and what Shelby County v. Holder did to it.
The question the case leaves hanging is simple and unsettling: if Congress still believes certain election changes pose predictable risks in specific places, what kind of updated formula, if any, can survive the Court’s demand for “current conditions” and equal treatment of the states?