The 10th Amendment affirms that most undelegated powers remain with the states

Adopted to reassure skeptics of an overly powerful federal government, the amendment was meant to curb federal overreach and preserve state control over most everyday governance decisions.

The Ninth Amendment clarifies that people hold additional rights, not granted by the Constitution

The Founders worried that listing specific rights might imply that others didn't exist. The Ninth clarifies that unenumerated rights are retained by the people, making it one of the most philosophical and least litigated amendments.

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.

The powers of local government are rooted in state law, not the Constitution

Unlike the federal government or the states, local governments have no constitutional standing—they exist only because state law allows them to. A state legislature can redraw a city's boundaries, strip its powers, or dissolve it entirely.

The Second Amendment protects the right to keep and bear arms

One of the most debated amendments, the Second Amendment has divided courts, lawmakers, and the public for decades. The Supreme Court held in 2008's District of Columbia v. Heller that it protects an individual right. Legal challenges continue today.

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.

Federalist 10 argued that a large republic best protects liberty

In Federalist 10, James Madison argued that a broad federal government could better control factions than small states (like classical city-states in ancient Greece). This foundational text in American political thought reframed the Constitution as a solution to political division rather than a threat to self-government.

McCulloch v. Maryland upheld implied powers and blocked states from taxing the federal government

In 1819, McCulloch v. Maryland confirmed that Congress may use implied powers under the necessary and proper clause and ruled that states cannot tax federal institutions, reaffirming the supremacy of the federal government within its constitutionally delegated powers.

The Supreme Court has never definitively settled federal war powers

Despite more than two centuries of conflict over war powers, the Supreme Court has consistently avoided defining the precise boundary between congressional and executive authority, leaving that boundary to be contested by the political branches.

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.

The Bill of Rights was designed to protect individuals from the power of the federal government

When the Bill of Rights was ratified in 1791, its protections applied only to the federal government. It wasn't until the 14th Amendment (1868) and the Supreme Court's doctrine of selective incorporation that most provisions were extended to state governments—a process that began in 1925.

The Constitution grants Congress more powers than the president

Article I outlines detailed congressional powers—taxation, spending, war declarations, and lawmaking—while Article II gives the president limited, broadly defined authority. This design reflects the framers' intention to prevent executive overreach.

The Bill of Rights originally proposed 12 amendments, not 10

Congress proposed 12 amendments in 1789, not 10. Of the two amendments not ratified, the one on congressional pay raises remained dormant for 203 years before finally becoming the 27th Amendment in 1992.

The reservation system gives tribes limited self-governance while keeping them under federal control

Federal law designates Native nations as "domestic dependent nations"—a legal category that recognizes limited tribal sovereignty while subordinating tribes to federal authority. This ambiguous status, introduced by Chief Justice John Marshall's 1831 opinion in Cherokee Nation v. Georgia, has shaped conflicts over land and governance ever since.

Two doctrines of local governance determine how much power cities actually have

Under what is known as "Dillon's Rule," local governments can only exercise powers explicitly granted by the state. Under "home rule," cities have broader self-governing authority—but the balance between the two depends entirely on state law.

Ratified in 1868, the 14th Amendment guaranteed citizenship to all people born in the United States and required states to provide equal legal protection to all.

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 necessary and proper clause of the Constitution allows Congress flexibility in governing

The Constitution authorizes Congress to pass laws needed to carry out its enumerated powers, which, over time, have become one of the Constitution's most powerful sources of federal authority.

The Third Amendment bars the forced housing of soldiers in private homes

The amendment was designed to address a specific grievance of the Colonies and remains the only Bill of Rights provision that has never been directly tested by a Supreme Court ruling on its merits.

Thomas Jefferson and John Marshall clashed over national power and states' rights

Distant cousins Jefferson and Marshall advanced opposing constitutional visions—Jefferson favoring states' rights and local majorities, while Marshall defended broad federal authority and judicial review. Through decisions such as McCulloch v. Maryland, Marshall advanced national supremacy over state resistance.

An 1873 Supreme Court case about slaughterhouses weakened parts of the 14th Amendment

In 1873, the Supreme Court's Slaughterhouse Cases ruled that the 14th Amendment's "privileges or immunities" clause protected only federal—not state—citizenship rights, greatly limiting the amendment's power to safeguard enslaved people from state discrimination.

The Supreme Court blocked states from setting term limits for Congress

In US Term Limits v. Thornton (1995), the Supreme Court struck down state laws that tried to impose term limits on their congressional delegations. The court ruled such restrictions unconstitutional unless added through a federal amendment.

The Fifth Amendment covers a wide range of legal protections for those accused of a crime

While it is widely known for the right against self-incrimination, the Fifth Amendment also protects against being charged for the same crime twice, requires grand jury indictments for serious crimes, and mandates compensation when the government takes private property for public use.

The Constitution gives Congress sweeping control over the federal budget

Article I, Section 8's Spending Clause authorizes Congress to tax, pay debts, and promote the "common Defence and general Welfare," making it one of Congress's most powerful tools—and the constitutional foundation of federal budget control.

The Seventh Amendment guarantees the right to a jury trial in federal civil cases

Ratified in 1791, this amendment applies to cases where more than $20 is at stake—an amount that has never been adjusted for inflation.

The First Amendment protects 5 distinct freedoms

Most Americans cite the amendment on free speech, but the First Amendment also protects religion, the press, peaceful assembly, and the right to petition the government—five separate guarantees in a single sentence.

The House of Representatives controls the $7T federal budget

The House holds the exclusive "power of the purse" to initiate revenue bills, a provision in the US Constitution designed to divide power with the Senate and give states with larger populations greater influence over federal budgeting.

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 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 Constitution included compromises that still shape the US today

The creation of the Constitution necessitated numerous compromises to accommodate the diverse interests of the states. The significant compromises included resolutions on debates over representation in Congress and the status of enslaved individuals.

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.

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.

The solicitor general argues the federal government's cases before the Supreme Court

Sometimes called the "10th justice," the solicitor general is the DOJ official responsible for representing the United States before the Supreme Court—deciding which cases the government will appeal, filing briefs, and arguing on behalf of federal interests.

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.

Before the 16th Amendment, US tax law required direct taxes to be directly apportioned to a state's population

Due to these requirements, the federal government could not impose many direct taxes. Direct taxes include property and income taxes, whereas indirect taxes include duties and excises.

10 of the original 14 copies of the Bill of Rights still exist

Clerks produced 13 copies for the states, plus one federal copy. Today, eight states still hold theirs. Georgia's and New York's were likely burned, Pennsylvania's was stolen, and Maryland's whereabouts remain unknown.

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.