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.

The United States is the world's oldest continuously operating federal system under a written constitution

The US pioneered federalism in the late 18th century, and many countries later adopted federal systems to manage conflict and share power. This resource features interactive maps that trace the spread of federal systems worldwide from 1900 to the present.

Explore the countries with a federal system—and see how they work

This resource from the Forum of Federations catalogs the world's federal countries. It provides background information on each, including the emergence of federalism, the division of power, and the practical interaction between national and regional governments.

Federalism creates tension between national and state power by design

Federalism assigns authority so that neither the national government nor the states entirely dominate the other or the people they govern. By creating overlapping claims of power, the system makes negotiation, conflict, and compromise a permanent feature rather than a failure.

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.

The Federal Reserve is the central bank of the US

No institution wields more power in US finance than the Federal Reserve—but opinion polls indicate that most Americans don't know what it does. Curious about the country's central bank? 1440's got your breakdown of how the Federal Reserve works.

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 Articles of Confederation were not a federal system

Ratified in 1781, the Articles of Confederation left the states sovereign and independent, denied the national government power to tax or regulate commerce, and forced Congress to act through the states—exposing the limits of confederation and paving the way for US federalism.

Colonial self-rule fostered strong autonomy and distrust of centralized power

American colonies were governed through a patchwork of different systems, ranging from Crown-run to locally controlled. Broad local autonomy—often followed by sudden imperial crackdowns—taught colonial leaders to prize home rule and distrust distant centralized power, attitudes that later informed US federalism.

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

Hamilton proposed one of the strongest visions of national government

At the Constitutional Convention, Alexander Hamilton advanced a plan modeled partly on Britain's system, calling for a powerful national executive and for senators to serve for life (with good behavior)—proposals that failed to gain widespread support.

Map of union membership by state

In the United States, unions exist across the entire country, but some states have more union members than others. Multiple reasons exist: from policy differences across states, to industrial and cultural influences. Want to learn more? Find out which state has the highest percentage of union membership, and which one has the lowest, through this map.

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.

How presidential systems differ from parliamentary governments

In presidential systems like the US, the executive and legislature are separately elected, giving presidents fixed terms and independent authority. In parliamentary systems, executives are elected by legislatures and can be removed by a simple vote of no confidence.

The US federal government employs roughly 3 million people

Tracking began in 1939, when the federal workforce consisted of about 1 million people. The total peaked in 1990 at 3.4 million, and hit a recent low in 2014 at 2.7 million.

There are 6 primary governing bodies at the UN

The United Nations is structured around six main bodies: the General Assembly, Security Council, Economic and Social Council, Trusteeship Council, International Court of Justice, and Secretariat. Each plays a distinct role in promoting peace, justice, and cooperation worldwide.

The United States currently ranks number one for countries that enable the most financial secrecy

Financial secrecy refers to complex systems that make it easy for people and companies to hide assets. High levels of financial secrecy are associated with illegal activity, like drug trafficking and money laundering. Lax regulations around reporting who owns trusts, real estate, and businesses impact the United States' global financial secrecy ranking.

State and local governments fund very different services

Local governments allocate 39% of their spending to K-12 education, while states allocate less than 1% directly—although much of local education funding actually comes from state and federal grants to local communities. States instead allocate their budgets to public welfare and health programs (45%) and higher education (15%).

Government shutdowns, 101

Roughly a quarter of the US federal government's spending must be approved annually through a set of 12 appropriations bills in Congress. When they aren't, a government shutdown ensues, where federal agencies are legally barred from spending any further money on nonessentials. This explainer covers the basics of government shutdowns and their impact on the broader culture.

The president can federalize state National Guard units during national emergencies

While the governor usually commands their state's National Guard, the president can assume control—federalizing the guard—under laws like the Insurrection Act or Title 10. Once federalized, troops operate under the US military chain of command.

Roughly half of the world's nations are (relatively young) electoral democracies

Classifying countries by governance type involves leaning into technical systems like the Regimes of the World classification. In this data dive, see a map of the world's oldest and youngest electoral democracies, as well as liberal democracies (which are measured by the protection of minorities and checks on executive power from the legislature).

Not all public lands are part of the National Park System

The entire National Park System is located on public lands. There are four different land management agencies in the United States, including the National Park Service.

New York City's five boroughs each function as a separate county under state law

Each of New York City's five boroughs—Manhattan, Brooklyn, Queens, the Bronx, and Staten Island—corresponds to a separate county under New York State law, forming a layered government structure that is unique among major American cities.

The firms running America's voting systems

Three companies make up over 90% of the US market share around voting systems, and like any company, they're priorities aren't always aligned with the public's. Dive into the industry of voting machines in this investigation piece from the Guardian.

How China's 'one country, two systems' works

"One country, two systems" is a principle put forth by the People's Republic of China as its approach toward formerly independent regions like Hong Kong and Macau. Supposedly promising administrative independence, China has not always been consistent in its application. Currently, it plans to offer the same arrangement with Taiwan. Learn more in this brief video.

Most Americans support the separation of church and state

A 2021 Pew survey found that 55% of Americans strongly or moderately support the separation of church and state, while 14% favor integrating religion more into government.

86% of the world's 12,321 nuclear warheads are held by just two countries

As of early 2026, the US and Russia together control about 86% of the world's more than 12,000 nuclear warheads—over 9,600 in military stockpiles. None of the seven other nuclear nations holds more than 600.

The power and influence of the American presidency have expanded significantly over time—far beyond what the founders envisioned.

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

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

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

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 USPS spent $3.97B in 2024, accounting for .058% of the federal budget.

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.

The idea for the Federal Reserve was conceived in secret in 1910—with bankers donning duck hunt gear for disguise while traveling to a remote country club on Georgia's Jekyll Island

How fusion—which releases energy when two lighter atoms combine to form a heavier atom—differs from fission

Roughly 43 million US borrowers owe roughly $1.7T in student debt, the second-largest source of consumer debt behind mortgages.

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.

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

The United States has had a tumultuous relationship with Cuba since its 1959 revolution, highlighted by a nuclear crisis and a decades-long trade embargo.

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.

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.

In 2026, Finland was named the world's happiest country for the ninth consecutive year based on its wealth, social safety network, and high life expectancy, among other factors.

Experimental hantavirus vaccines and therapies, still under development, have long been funded by the US military.

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

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.

Chaos theory—informally known as the butterfly effect—is the reason why weather forecasts are presented with probabilities rather than certainties.

Lesser-known phobias include turophobia, or the fear of cheese, and nomophobia, the fear of being without your cell phone.

The Great Salt Lake's distinct dual coloration results from high-salinity organisms that only live in the northern portion and produce a purple protein.

For centuries, it was common to sleep in two shifts: a few hours at the beginning of the night, and a longer period beginning around midnight