United States federal government

The U.S. Constitution, ratified in 1788 and effective in 1789, establishes the federal government's structure, dividing power among three branches to prevent any one from dominating. Article I vests legislative power in Congress, a bicameral body comprising the House of Representatives and the Senate; Article II vests executive power in the President; Article III vests judicial power in the Supreme Court and inferior courts. This separation is reinforced by a system of checks and balances: the President can veto legislation, Congress can override vetoes and impeach officials, and the judiciary can declare laws unconstitutional through judicial review, a power asserted in Marbury v. Madison (1803).¹

Congress, the legislative branch, writes and passes federal laws, levies taxes, and appropriates funds; the House initiates revenue bills, while the Senate confirms presidential appointments and ratifies treaties. The executive branch, headed by the President, enforces laws through federal agencies and departments, and the President serves as Commander-in-Chief of the armed forces. The judicial branch, led by the Supreme Court, interprets laws and reviews their constitutionality; federal judges hold lifetime appointments during good behavior. Together, these branches administer a vast federal bureaucracy that implements policies ranging from national defense to social insurance.

The federal government operates within a federalist system, sharing sovereignty with state governments. The Constitution grants enumerated powers—such as regulating interstate commerce, coining money, and declaring war—while the Tenth Amendment reserves unlisted powers to the states or the people. Over time, Supreme Court rulings and constitutional amendments have expanded federal authority, particularly through the Commerce Clause and the Fourteenth Amendment, enabling national action on civil rights, environmental protection, and healthcare. However, federalism remains contested, with ongoing debates over the balance of power between Washington and the states.²

Beyond the familiar three branches, the federal government includes independent agencies and commissions that operate with partial autonomy, such as the Federal Reserve and the Securities and Exchange Commission. The District of Columbia, the federal seat, has a unique status: its residents pay federal taxes but lack voting representation in Congress, a subject of ongoing advocacy. The federal government also owns roughly 28% of U.S. land, concentrated in Western states, managed by agencies like the Bureau of Land Management. Additionally, the government operates the Smithsonian Institution, the world's largest museum complex, and the U.S. Postal Service, a constitutionally mandated service.³

Separation of powers

The division of governmental authority into legislative, executive, and judicial branches to prevent concentration of power.

Checks and balances

A system where each branch can limit the powers of the others, ensuring no single branch becomes dominant.

Federalism

A system of government in which power is divided between a central authority and constituent political units (states).

Judicial review

The power of courts to declare laws or executive actions unconstitutional.