Famous Court Cases in History That Changed America

A small group of Supreme Court rulings has done more to shape everyday life in the United States than most acts of Congress. The famous Supreme Court cases that changed America established the Court’s authority to strike down laws, ended legal segregation, defined what police can do to you and what they must tell you, and drew and redrew the constitutional line around personal decisions like whom you marry and whether you can end a pregnancy. Read together, they show how the meaning of a two-century-old document gets settled case by case.

Marbury v. Madison (1803) and the Power to Strike Down Laws

Before 1803, it was an open question whether the Supreme Court could invalidate an act of Congress. The question got answered in a fight over a job. William Marbury had been named a justice of the peace by the outgoing Adams administration, but the new Secretary of State, James Madison, refused to deliver his commission. Marbury took the dispute straight to the Supreme Court under Section 13 of the Judiciary Act of 1789, which gave the Court authority to order government officials to act.¹

Chief Justice John Marshall concluded that Marbury deserved the commission but that Section 13 itself was defective, because it tried to expand the Court’s original jurisdiction beyond what the Constitution allowed. A regular statute, Marshall wrote, cannot override the Constitution, and “it is emphatically the province and duty of the Judicial Department to say what the law is.”²

Marbury lost his commission. The Court gained the power of judicial review. Every time a court since has struck down a law as unconstitutional, the authority traces back to this decision.

From Plessy v. Ferguson (1896) to Brown v. Board of Education (1954)

For nearly sixty years, legal segregation across the country rested on one ruling. Homer Plessy, a man of mixed race, challenged a Louisiana law requiring separate railroad cars for white and Black passengers. The Court upheld the law 7-1, reasoning that separation did not stamp anyone with a badge of inferiority, and that if it did, “it is not by reason of anything found in the act, but solely because the colored race chooses to put that construction upon it.”³

That reasoning gave states cover to segregate schools, hospitals, buses, restaurants, and public facilities, so long as the separate versions were nominally “equal.” They rarely were, and courts rarely looked.

The doctrine came apart in Topeka, Kansas, where Oliver Brown’s eight-year-old daughter Linda was refused admission to a white elementary school. The Browns’ lawsuit was consolidated with challenges from South Carolina, Virginia, Delaware, and the District of Columbia.⁴ A unanimous Court, relying in part on social science research about what segregation does to children, held that separating students by race creates a sense of inferiority that damages their ability to learn regardless of how equal the buildings might be. Separate educational facilities, the Court concluded, are inherently unequal.⁵

The follow-up ruling the next year told states to desegregate “with all deliberate speed,” phrasing the National Archives has called “careful, if vague.”⁶ The vagueness let resistant states drag their feet for years. Brown still stands as the constitutional foundation for the principle that government-mandated racial separation in public services is unlawful.

Mapp v. Ohio (1961) and Illegally Seized Evidence

Before 1961, police in many states could search your home unlawfully and still use whatever they found against you at trial. Federal courts excluded illegally obtained evidence; most state courts did not. Dollree Mapp changed that. Cleveland officers forced their way into her home without a valid warrant, claiming to look for a bombing suspect, and searched every dresser, closet, suitcase, and personal paper before charging her with possessing materials they found.⁷

The Supreme Court held that the Fourth Amendment’s protection against unreasonable searches applies to state governments as well as the federal government, and that evidence seized in violation of the Constitution cannot be used in any criminal trial. Without that rule, the Court reasoned, police would have no real incentive to respect constitutional limits. The exclusionary rule exists to “compel respect for the constitutional guaranty in the only effectively available way—by removing the incentive to disregard it.”⁷

Gideon v. Wainwright (1963) and the Right to a Lawyer

Clarence Earl Gideon was charged with a felony for allegedly breaking into a Florida poolroom. He could not afford a lawyer and asked the judge to appoint one. The judge refused, because Florida then required appointed counsel only in death penalty cases. Gideon represented himself, lost, and drew a five-year prison sentence.⁸

From his cell, Gideon handwrote a petition to the Supreme Court. The justices agreed with him. The Sixth Amendment right to counsel is a fundamental right, and through the Fourteenth Amendment it binds state courts too. A person too poor to hire a lawyer cannot get a fair trial unless the court provides one. Lawyers in criminal cases, the Court said, are “necessities, not luxuries.”⁸

Public defender offices expanded across the country to meet the requirement. One limit is worth knowing: the right to an appointed lawyer applies only in criminal cases. In civil matters like evictions and debt collection, people who cannot afford counsel generally have no right to one.

Miranda v. Arizona (1966) and the Warnings Police Must Give

Ernesto Miranda was arrested in a kidnapping case and questioned at a police station for two hours. Officers never told him he had the right to stay silent or to have a lawyer. He signed a confession, and prosecutors made it their key evidence.⁹

The Supreme Court threw out the confession. The pressure of custodial interrogation, the justices reasoned, can effectively compel people to speak against their own interest, undermining the Fifth Amendment’s protection against self-incrimination. Before any custodial questioning, police must tell a suspect that they have the right to remain silent, that anything they say can be used against them, and that they have the right to an attorney, including a court-appointed one if they cannot afford to hire one.¹⁰

The Public Safety Exception

Miranda has a narrow exception. In New York v. Quarles (1984), officers chased an armed suspect into a supermarket and found him wearing an empty shoulder holster. Before reading his rights, an officer asked where the gun was, and the suspect nodded toward some milk cartons and said, “The gun is over there.” The Court admitted the statement, because an unsecured loaded gun in a public store posed an obvious danger.¹¹ The exception covers only questions driven by an immediate safety concern, not questions aimed at building a case. Once the danger is handled, standard Miranda rules resume.

Loving v. Virginia (1967) and the Right to Marry

Richard and Mildred Loving married in Washington, D.C., where their interracial marriage was legal, then returned to Virginia, where it was a crime. Police arrested them in their bedroom. They pleaded guilty, and the trial judge suspended a one-year jail sentence on the condition that they leave Virginia and not return together for twenty-five years.¹²

A unanimous Supreme Court struck the law down under both the Equal Protection and Due Process Clauses of the Fourteenth Amendment. On equal protection, the justices noted that the law only banned interracial marriages involving white people, exposing it as a tool of white supremacy rather than a neutral rule. On due process, the Court declared that “the freedom to marry has long been recognized as one of the vital personal rights essential to the orderly pursuit of happiness by free men.”¹²

The ruling invalidated similar laws in Virginia and fifteen other states. It also established marriage as a basic civil right the government cannot restrict through racial classification, a principle that would matter again decades later.

Tinker v. Des Moines (1969) and Speech at School

In December 1965, students in Des Moines, Iowa, wore black armbands to school to protest the Vietnam War. Administrators suspended them. The Supreme Court sided with the students 7-2, declaring that they do not “shed their constitutional rights to freedom of speech or expression at the schoolhouse gate.”¹³

The ruling created what is now called the substantial disruption test. Schools can restrict student expression only when it would “materially and substantially interfere” with school operations or invade other students’ rights. A school’s discomfort with an unpopular viewpoint is not enough on its own.

Roe v. Wade (1973) and Dobbs v. Jackson (2022)

In 1973, the Court ruled 7-2 that the Constitution’s protection of personal privacy, grounded in the Fourteenth Amendment’s Due Process Clause, is “broad enough to encompass a woman’s decision whether or not to terminate her pregnancy.” The decision struck down a Texas law that criminalized abortion except to save the mother’s life.¹⁴

Roe used a trimester framework. In the first trimester, the decision belonged to the woman and her doctor. In the second, states could regulate in ways related to maternal health. After viability, states could prohibit abortion except when needed to protect the mother’s life or health. Later modified by Planned Parenthood v. Casey in 1992, the framework governed abortion law nationwide for nearly fifty years.¹⁴

In 2022, the Court overturned Roe in Dobbs v. Jackson Women’s Health Organization. The majority held that the Constitution “does not confer a right to abortion” and that authority to regulate it “must be returned to the people and their elected representatives.” Abortion, the Court said, is not a right “deeply rooted in the Nation’s history and traditions,” noting it had been a crime in every state until the latter part of the twentieth century.¹⁵

When the Court Reverses Itself

Dobbs raised a question that runs through the whole list. Stare decisis generally favors sticking with prior rulings, but the Court weighs factors like whether the original reasoning was sound, whether lower courts have found the rule workable, whether later cases have already chipped away at it, whether the underlying facts or society’s understanding of them has shifted, and whether people have relied on the ruling in ways that would cause hardship if it were undone.¹⁶ The Court has overturned its own precedent more than 200 times. Brown reversed Plessy. Gideon reversed Betts v. Brady. Reversal is always possible; the question is whether the justification clears the bar.

Obergefell v. Hodges (2015) and Same-Sex Marriage

James Obergefell sued Ohio after the state refused to list him on his husband’s death certificate. Ohio would not recognize their Maryland marriage. His case was consolidated with challenges from several other states, and the Court ruled 5-4 that same-sex couples have a fundamental right to marry under the Fourteenth Amendment’s Due Process and Equal Protection Clauses.¹⁷

Justice Kennedy’s majority opinion drew directly on Loving and other marriage cases. “The right to personal choice regarding marriage is inherent in the concept of individual autonomy,” he wrote, and the reasons marriage is fundamental “apply with equal force to same-sex couples.” Denying marriage to those couples, especially against a long history of disapproval, “works a grave and continuing harm, serving to disrespect and subordinate gays and lesbians.”¹⁷

Every state now has to both issue marriage licenses to same-sex couples and recognize same-sex marriages performed elsewhere. The ruling is one of the largest civil rights expansions of the twenty-first century, and a direct descendant of the principle Loving set almost fifty years earlier: the government cannot pick who you marry based on a characteristic irrelevant to the institution.

1
Constitution Annotated. ArtIII.S1.4.4 Inherent Power to Issue Judgments
2
Justia U.S. Supreme Court Center. Marbury v. Madison, 5 U.S. 137 (1803)
3
National Archives. Plessy v. Ferguson (1896)
4
National Archives. Biographies of Key Figures in Brown v. Board of Education
5
Justia U.S. Supreme Court Center. Brown v. Board of Education of Topeka, 347 U.S. 483 (1954)
6
National Archives. Brown v. Board of Education (1954)
7
Justia U.S. Supreme Court Center. Mapp v. Ohio, 367 U.S. 643 (1961)
8
Justia U.S. Supreme Court Center. Gideon v. Wainwright, 372 U.S. 335 (1963)
9
Justia U.S. Supreme Court Center. Miranda v. Arizona, 384 U.S. 436 (1966)
10
Constitution Annotated. Amdt5.4.7.3 Miranda and Its Aftermath
11
Justia U.S. Supreme Court Center. New York v. Quarles, 467 U.S. 649 (1984)
12
Justia U.S. Supreme Court Center. Loving v. Virginia, 388 U.S. 1 (1967)
13
Justia U.S. Supreme Court Center. Tinker v. Des Moines Independent Community School District, 393 U.S. 503 (1969)
14
Justia U.S. Supreme Court Center. Roe v. Wade, 410 U.S. 113 (1973)
15
Supreme Court of the United States. Dobbs v. Jackson Women’s Health Organization (2022)
16
Constitution Annotated. ArtIII.S1.7.2.3 Stare Decisis Factors
17
Legal Information Institute. Obergefell v. Hodges