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

Germany's Constitutional Court can review laws without waiting for a specific case

The German court follows a model of "abstract judicial review"—meaning it can assess the constitutionality of legislation in the abstract, rather than only in concrete disputes. Its binding decisions apply to all German courts.

The US framework of government has influenced the constitutions of many other countries

In 1787, the US Constitution introduced a system built on the separation of powers and individual liberties, including freedom of speech and religion. Though widely influential, its rigidity has made it less of a modern model as countries adopt more adaptable constitutional frameworks.

Take a deep dive into the constitutional foundations of judicial review

In this episode of "This Constitution," the hosts take a law-focused approach to judicial review—examining its roots in Article III and the supremacy clause, its development through Marbury v. Madison, and the ongoing constitutional debates about whether the court's power strengthens or strains American democracy.

The separation of powers is a pivotal component of the US Constitution

Explore how the three branches interact through the Supreme Court case of US v. Alvarez. The Supreme Court first struck down a law, then Congress and the president later revised it—illustrating how judicial review can reshape legislation and executive action.

Courts referee federalism disputes between Congress and the states

Modern federalism is primarily worked out through litigation. The Supreme Court decides disputes in written opinions that explain when federal law preempts state authority, how far Congress's powers extend, and when states may resist.

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

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

Over more than two centuries, the Supreme Court has struck down nearly 1,000 federal, state, and local measures—exercising its authority to invalidate laws that conflict with the Constitution and shaping civil rights, the separation of powers, and the scope of government authority.

John Marshall advanced federal supremacy and judicial review

Marshall's jurisprudence emphasized that the Constitution is the supreme law of the land, enforceable by an independent judiciary. Through his court's decisions, he affirmed judicial review, broad implied powers for Congress, and federal authority to override conflicting state laws.

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.

States are constitutionally mandated to draw their own congressional districts

Under Article I, Section 4 of the US Constitution, state legislatures possess the authority to determine how congressional districts are drawn. However, Congress retains the power to alter these rules if it chooses to.

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 US Constitution has been amended 27 different times since its ratification

Dive deeper into each amendment to the Constitution with resources provided by the National Constitution Center. This website features podcasts, videos, and other web resources for each of the amendments, examining their creation and their impact on today’s political and social landscape.

Not all speech in the United States is protected

This page explains the categories of speech—including defamation, incitement, true threats, fraud, and obscenity—the Supreme Court has placed outside First Amendment protection and how courts determine which standard to apply when speech is challenged.

Early American citizenship was defined inconsistently by individual states

The original US Constitution did not define national citizenship, leaving it to the states to apply their own rules. This led to inconsistent and often exclusionary standards across the country until after the Civil War.

Parliament is the supreme legal authority under the UK's constitutional system

The principle of "parliamentary sovereignty" holds that the UK Parliament can make or repeal any law, and that courts cannot invalidate its legislation. Judicial bodies can reshape governance, but parliamentary laws remain legally supreme.

Most Americans support age limits for justices, elected officials

As members of Congress and Supreme Court justices continue to serve at an average age far older than in the past, polls show a majority of Americans favor setting an age limit for these roles. Roughly 79% support caps for federal elected officials, and 74% favor such limits for Supreme Court justices. A constitutional amendment would be required.

The commerce clause gives the federal government authority to regulate interstate economic activity

This short constitutional provision has allowed Congress to regulate everything from wheat production to racial segregation, greatly expanding federal power by linking national authority to interstate economic activity.

Grand juries investigate crimes and decide whether the government has enough evidence to charge someone

Unlike trial juries, which determine guilt, grand juries decide whether there is probable cause to bring charges at all. If they find enough evidence, they issue a formal indictment. Federal grand juries are enshrined in the Fifth Amendment of the US Constitution.

Every US state constitution references God or the divine, though the federal Constitution does not

God or the divine is mentioned at least once in all 50 state constitutions and nearly 200 times overall. Massachusetts has the most, with eight references, and four states do not use the word "God" but instead refer to a "Supreme Being" or "Divine Guidance."

Courts have blocked the Trump administration's 2025 executive order limiting birthright citizenship

In June 2025, the Supreme Court declined to rule on the constitutionality of the order. Since then, two federal appellate courts have found the order unconstitutional, halting its enforcement nationwide.

Compare how justice ministries and courts are structured around the world

The Federal Judicial Center's "Judiciaries Worldwide" series provides clear and accessible comparisons of how various countries organize their justice ministries, prosecutors, courts, and judicial councils—emphasizing global models of independence, oversight, and institutional structure.

The Senate's filibuster—a procedure that allows for unlimited debate—is not in the Constitution

In the United States Senate, the filibuster enables senators to delay or block legislation. Ending debate became possible in 1917 with a cloture rule requiring a two-thirds vote. In 1975, that was changed to 60 votes in most cases.

Constitutional originalism and living constitutionalism are the 2 main theories of interpretation

Hear from experts about originalism—the view that the Constitution should be interpreted according to its original public meaning—alongside its main counter-ideology, living constitutionalism, which argues that the document's meaning should evolve with changing social and legal norms.

The roots of American law and the jury system trace back to medieval England

King Henry II established a jury of 12 local knights to settle land disputes in the 12th century, and his judges developed national laws common to everyone. American courts inherited this "common law" tradition directly from the English system.

Immigration courts are part of the DOJ, not the judicial branch

Unlike federal courts, immigration courts operate under the DOJ's Executive Office for Immigration Review—meaning immigration judges are DOJ employees, not independent judicial officers, and their decisions can be reviewed and overturned by the attorney general.

The US has 575 federally recognized tribal nations, each a sovereign government

Tribal governments are sovereign, with authority to pass laws, run courts, and levy taxes on their lands. Unlike cities or counties, they are not created by states. Their sovereignty predates the United States itself and is recognized in the Constitution, treaties, and federal law.

Citizens United v. Federal Election Commission allowed unlimited independent spending in US elections

The 2010 Supreme Court ruling allowed corporations and other outside groups to spend unlimited money on elections independently of candidates—while leaving direct contribution limits intact—expanding the role of wealthy donors and outside influence in American political campaigns.

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

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.

The American Society of Civil Engineers' infrastructure report card gave the US a C in 2025, its highest grade since the project launched in 1998.

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

The US dollar is the most widely circulated currency in the world, and is involved in nearly 90% of global transactions

44% of Americans say they pray at least once a day—discover how your state's religiosity stacks up against the rest of the country.

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.

All rainbows are 'raincircles' caused by water droplets separating white sunlight into a spectrum of colors, but Earth's surface blocks the bottom half of the circle from our line of sight.

Discover the catastrophic consequences of a failure of the US electrical grid—something that is more likely than many Americans think.

Some coin denominations have ridges etched on their sides, partly to prevent counterfeiting, in a practice called 'reeding.'

The price of gas is a composite made up of several different factors, with the federal gas tax making up less than 20% of what drivers pay at the pump.

Explore an interactive map of battles from the American Revolution, along with detailed summaries of each engagement

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

At the beginning of the 20th century, a group of young men ate standard American food—replete with food additives like borax and formaldehyde—as part of government research to better understand food safety.

Legendary architect Frank Lloyd Wright designed the SC Johnson headquarters in Wisconsin, aiming to make a cathedral-like workplace

The 19th-century painters of the Hudson River School were among the first American romantics, with portraits that displayed the natural beauty of the young country.

Iran's Revolutionary Guard Corps is independent of Iran's regular army and is one of the most powerful and influential military-political organizations in the Middle East.

Tattoos remain visible on your skin thanks to immune cells called macrophages

Poison ivy's rash-causing compound is found in the plant's roots, stem, and leaves—so coming into contact with any part of the plant can lead to rashes for the 85% of people who are allergic to it.

Famed poet TS Eliot rejected the manuscript for George Orwell's political fable 'Animal Farm,' writing that its criticism of authoritarianism was not 'the right point of view.'

Studies suggest when you sleep is as important as how much you get, and syncing with your circadian rhythms may lead to less fatigue and improved long-term health outcomes