Explore the nearly 1,000 laws, regulations, and provisions the court has held unconstitutional since Marbury v. Madison

Marbury v. Madison established the Supreme Court's power of judicial review

The 1803 ruling empowered courts to strike down laws that violate the Constitution, permanently expanding the Supreme Court's authority and cementing its role as a coequal branch. This video explains the case and its lasting impact.

Read the majority opinion that established judicial review

In his opinion in Marbury v. Madison, Chief Justice John Marshall argued that a written constitution is "paramount law" and that courts must refuse to enforce statutes that conflict with it. He declared that "it is emphatically the province and duty of the Judicial Department to say what the law is."

Explore the most impactful Supreme Court cases in US history

Browse by constitutional topic to explore key rulings, their historical impact, and the legal principles they established. Each case includes a summary of the decision, along with notable excerpts from majority and dissenting opinions.

John Marshall presided over more than 1,100 Supreme Court decisions

During his 34-year tenure, the Marshall court issued 1,129 decisions, including 1,042 unanimous rulings. Marshall authored more than 500 majority opinions—over half of the court's total output during his tenure as chief justice.

The powers of the judicial branch have expanded since the nation's founding

Initially, the Supreme Court was seen as the weakest branch, lacking "the power of the sword or the purse," as Alexander Hamilton noted in *Federalist No. 78*. This podcast explores the political conflicts and pivotal decisions that transformed the court into the powerful constitutional authority it is today.

In the US, any court can rule on constitutionality—unlike in most other countries

In the American system, known as diffuse judicial review, federal and state courts at every level may assess whether laws comply with the Constitution, and their decisions are ultimately reviewable by the Supreme Court. Many other democracies, by contrast, reserve constitutional review to specialized constitutional courts.

The Supreme Court limited federal judges' power to issue nationwide injunctions in 2025

In a 2025 decision arising from litigation over a presidential order on birthright citizenship, the Supreme Court held that individual federal judges may not nationwide block executive policies—curbing the use of sweeping injunctions and reshaping how constitutional challenges proceed through the courts.

The Bill of Rights spent more than a century largely ignored by the courts

When ratified in 1791, the Bill of Rights applied only to the federal government, which exercised little direct control over daily life. It played a limited role in early constitutional law until the 20th century, when legal advocates began using it to challenge state and local laws.

The man who gave 9 people power over everyone

In the US, nine unelected justices can shape some of the most personal and political parts of our lives. But the Supreme Court wasn't always this powerful. When it was first written into the Constitution, it had no clear authority, no real role, and little public respect.

Gibbons v. Ogden expanded federal power over interstate commerce

In 1824, the Supreme Court unanimously invalidated a New York steamboat monopoly, ruling that navigation between states constitutes interstate commerce. Chief Justice John Marshall held that Congress has authority over such commerce and that conflicting state laws are void under the supremacy clause.

The Dred Scott decision denied African Americans citizenship, upheld slavery, and marked the first use of judicial review since Marbury v. Madison

This page explores the case, providing information on Dred Scott and his case before the Supreme Court. Explore the implications of one of the most critical cases in the history of the court.

The US Constitution is widely regarded as the longest-standing written national constitution still in force—see how it has influenced rights worldwide.

The supremacy clause establishes federal law as the highest authority

The supremacy clause states that the United States Constitution and federal laws enacted under it supersede conflicting state laws, ensuring national authority prevails when federal and state governments disagree.

The Judiciary Act of 1789 created the foundation of the federal justice system

Passed by the First Congress, the Judiciary Act of 1789 established the federal court system, the Office of the Attorney General, and the US Marshals Service—the first law concerning national law enforcement and legal administration.

Thousands of state voting changes have been federally blocked since the Voting Rights Act

Since 1965, federal oversight has blocked thousands of state-level voting changes—including redistricting plans—by requiring approval for measures that could affect minority representation, a process scaled back by the Supreme Court in 2013.

Thousands of constitutional amendments have failed

Of nearly 12,000 proposed constitutional amendments, only 27 were ratified. This article highlights radical failed proposals that would have renamed the country, abolished the presidency, capped personal wealth, or fundamentally rewritten how American democracy works.

Trace how the Bill of Rights, inspired by centuries of political theory, took shape between 1774 and 1789.

Court-packing is the attempt to change the number of Supreme Court justices to shift the balance

Because the Constitution leaves the court's size to Congress, presidents have periodically sought to expand or reshape it. This explainer examines past efforts—including Franklin D. Roosevelt's failed 1937 plan—and why court-packing remains so controversial.

The first test of America's war powers came just a decade after the Constitution was ratified

During the undeclared Quasi-War with France in 1800, the Supreme Court ruled in Bas v. Tingy that Congress had authorized a valid "imperfect war" through statutes alone, without a formal declaration, establishing that there is a legal spectrum between peace and declared war.

Explore the specific authorities granted to Congress: the 'enumerated powers'

The Constitution grants Congress a list of powers—including taxing, regulating interstate commerce, and declaring war—while powers not explicitly listed are reserved to the states or the people, defining the federal government's scope of authority.

Read the Federalist Papers—the essays that defended the proposed Constitution

Written between 1787 and 1788, the Federalist Papers—85 essays by Alexander Hamilton, James Madison, and John Jay—defended the Constitution and articulated the logic of federalism. They remain a key guide to the original interpretation of the Constitution.

Explore the world's oldest constitutions

The 1789 US Constitution remains the oldest active written national constitution. Older systems exist—such as San Marino’s statutes or the Magna Carta—but they are not single, codified constitutions. See how other countries compare in this visualization.

Explore the use of executive orders over time

An executive order is a presidential directive that manages the federal government and carries the force of law when authorized by the Constitution or statute. Since 1789, more than 16,000 have been issued—Franklin D. Roosevelt used the most, signing 3,721 during his 12 years in office.

The Supreme Court's first major free-speech ruling rested on a legal standard that was later overturned

In Schenck v. United States (1919), the court introduced the "clear and present danger" test—permitting the government to restrict speech that posed an immediate threat to public safety. Although the doctrine was later replaced, the ruling upheld the conviction of a man who had distributed anti-draft pamphlets.

Visualize every time Congress has mentioned the word 'democracy' since 1880, and why

This Pudding interactive analyzes every mention of "democracy" in the Congressional Record over 145 years, charting how the word shifted from a partisan label to a concept, and tracking when lawmakers warned the system itself was under threat.

The nullification crisis tested whether states could defy federal law

In the 1830s, South Carolina declared federal tariffs void within its borders. President Andrew Jackson threatened military force, Congress passed a compromise tariff, and the episode ended with federal authority prevailing over state nullification.

The United States is one of only around two dozen countries with a fully federal system of government, in which power is divided between national and state governments.

Despite the Supreme Court ruling that President Donald Trump's 2025 tariffs were unconstitutional, billions of dollars in refunds remain unresolved

Over 2,000 lawsuits seeking refunds have been filed by major companies, including FedEx and Costco, but CBP says its systems can't handle the volume. Interest on unpaid refunds is accruing at an estimated $650M per month.

The rivalry between Alexander Hamilton and Thomas Jefferson centered on federalism—the question of how much power the federal government should hold relative to the states.

Despite being favored by 87% of Americans, Congress does not have term limits.

The original copy of the Declaration of Independence is not a pristine document, and even features a smudged anonymous handprint in the bottom left corner.

The story of Dollree Mapp, whose legal challenge over her 1957 conviction for possessing "obscene material" led to a major strengthening of the Fourth Amendment

Mark Twain spent decades feuding with the US Postal Service, convinced its costs and regulations were bureaucratic overreach.

See this overview of the firework rules across all 50 states, ranging from a complete ban on non-professional fireworks in Massachusetts to states with more lax rules like Indiana.

A century of Billboard issues documenting the evolution of popular music.

See 33 images that became central to huge scandals, including a young Charles and Camilla, Michael Jackson's baby on a hotel balcony, and Hugh Grant's mugshot.

Long before Major League Baseball began allowing instant replay for balls and strikes, an umpire reluctantly used the technology to determine whether a hit was a home run, a move that inadvertently ushered in a new era for the sport.

Gerrymandering works through two techniques: cracking opposing voters across districts to dilute their power, and packing them into a few to waste their votes in lopsided majorities.

View the ten deadliest tornadoes in US history.

Visualize the path of every solar eclipse from 1900 to 2099 and see what each looks like when observed from different locations on Earth.

Calculate how much of your tax dollars go to each federal program based on your income, filing status, and number of children

US intelligence allegedly pursued more than 600 schemes to assassinate Cuban revolutionary Fidel Castro.

As of 2025, the most cited papers in science include a review of graphene, methods to improve image recognition, streamlining electron density calculations, and optimizing protein studies.

Learn how to read a prospectus, the juicy document that any company must file with the SEC before going public.

In its famous catalog, Sears sold $600 DIY house kits from 1908 through the 1940s, resulting in an estimated 100,000 'Sears and Roebuck homes.'

Search a massive database of over 4 decades of clues from the TV quiz show 'Jeopardy!'

The first steps to rebuilding your credit score include getting to know exactly what's on your credit report and figuring out how far you are from the '700 club,' or 'good score' range.

Most of the observable universe's volume consists of voids and supervoids—enormous regions of space with little to no galaxies, stars, or light.

Learn how monoclonal antibodies, which mimic the body's antibodies, can fight diseases like Ebola.