Landmark Cases

Understand Landmark Cases in plain language, where the authority comes from, and how to find official records or next steps.

Search major constitutional decisions by facts, legal question, holding, impact, decision date, citation, and related Guide topic.

Courts answer legal questions through cases, records, arguments, and written decisions.

What makes a case landmark

A landmark case is a decision that changes how courts, public officials, lawyers, schools, agencies, or citizens understand the Constitution or federal law. Some landmark cases announce a new rule. Others apply an existing rule to a major national dispute, clarify the power of a branch of government, or mark a turning point in civil rights, criminal procedure, federalism, elections, or administrative law.

How to read a case record

Start with the facts because constitutional rules are applied to real disputes. Then identify the legal question the Court had to answer. The holding is the rule or answer the Court gave. The impact explains what changed after the decision, how later courts or officials used it, and why the case still appears in civic debates. The citation and decision date help visitors find the official record.

Facts The facts explain who brought the case, what happened, and why a court had to decide the dispute.
Question and holding The question frames the legal issue; the holding gives the Court’s answer.
Impact and later use The impact section connects the decision to later law, public policy, and everyday rights or powers.

Use cases with the rest of the guide

Cases should not stand alone. A decision about speech connects to the Bill of Rights. A decision about agency power connects to rulemaking and the executive branch. A decision about congressional authority connects to federalism, commerce, spending, or oversight. Use the archive as a pathway from a famous case name to the larger system of government.

Judicial Branch
Bill of Rights
Federal Court System
Judicial Review

How to use this page

Read the facts before the rule.

Landmark cases should be read as stories with facts, questions, holdings, and consequences, not as isolated slogans.

Start with facts A legal rule makes more sense after the dispute, parties, lower-court path, and question are clear.
Separate holding from impact The decision answers a legal question; later cases, agencies, and public institutions shape the impact.
Use official opinions For exact language, read the Court opinion or official court record rather than a summary.
Check jurisdiction Federal, state, trial, appeals, and Supreme Court records answer different questions.

Official starting points

Use these sources to check current text, records, deadlines, forms, votes, rules, or public notices.

U.S. Courts
Supreme Court of the United States
PACER
Constitution Annotated

Keep exploring

These related Guide pages help visitors connect the topic to the larger system.

Judicial Branch
Supreme Court
Judicial Review
Bill Of Rights

Find A Case

Search by case name, year, constitutional question, ruling, impact, or related topic.

1954 · U.S. Supreme CourtBrown v. Board of EducationThe decision reshaped constitutional law, public education, civil rights enforcement, and the relationship between courts and state governments.Open case 2010 · U.S. Supreme CourtCitizens United v. Federal Election CommissionThe decision reshaped campaign finance and political spending through outside groups.Open case 2022 · U.S. Supreme CourtDobbs v. Jackson Women’s Health OrganizationThe decision returned most abortion regulation to states and changed the constitutional landscape around substantive due process.Open case 1857 · U.S. Supreme CourtDred Scott v. SandfordThe decision is widely regarded as one of the Court’s worst decisions and helped intensify the conflict that led to the Civil War.Open case 1824 · U.S. Supreme CourtGibbons v. OgdenThe case helped define national power over interstate commerce and the limits of conflicting state action.Open case 1963 · U.S. Supreme CourtGideon v. WainwrightThe decision made the right to appointed counsel a basic requirement of fair criminal procedure.Open case 1803 · U.S. Supreme CourtMarbury v. MadisonMarbury v. Madison established judicial review: the principle that federal courts may refuse to apply laws that violate the Constitution. The decision made the Constitution an enforceable limit on Congress and the President and turned the Supreme Court into a central interpreter of constitutional meaning.Open case 1819 · U.S. Supreme CourtMcCulloch v. MarylandThe decision strengthened national power and became a foundation for understanding implied powers and federal supremacy.Open case 1966 · U.S. Supreme CourtMiranda v. ArizonaThe decision reshaped police interrogation and made Miranda warnings part of public legal culture.Open case 2015 · U.S. Supreme CourtObergefell v. HodgesThe decision nationalized marriage equality and linked liberty and equality principles.Open case 1896 · U.S. Supreme CourtPlessy v. FergusonThe decision allowed Jim Crow segregation to continue until later civil rights decisions rejected its logic.Open case 1973 · U.S. Supreme CourtRoe v. WadeThe decision shaped abortion law for nearly fifty years before being overruled by Dobbs v. Jackson Women’s Health Organization.Open case 2013 · U.S. Supreme CourtShelby County v. HolderThe decision changed federal voting-rights enforcement and shifted many disputes to litigation after laws take effect.Open case 1969 · U.S. Supreme CourtTinker v. Des MoinesThe decision remains a leading case on student speech and school authority.Open case 1974 · U.S. Supreme CourtUnited States v. NixonThe decision reinforced judicial authority and limits on presidential power.Open case 1952 · U.S. Supreme CourtYoungstown Sheet & Tube Co. v. SawyerThe case is a key example of judicial limits on presidential authority and separation of powers.Open case

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