How many branches of government are there?

The United States government has three branches: the legislative branch (Congress), the executive branch (the President and federal agencies), and the judicial branch (the federal courts). This structure was established by the Constitution in 1787 and is laid out in its first three articles. Article I creates Congress and gives it the power to make laws, raise taxes, declare war, and regulate commerce. Article II creates the presidency and gives the executive branch the power to enforce laws, command the military, conduct foreign affairs, and appoint federal officials. Article III creates the Supreme Court and authorizes Congress to establish lower federal courts, giving the judicial branch the power to interpret laws and decide cases involving federal law and the Constitution.

The framers, drawing on the writings of the French philosopher Baron de Montesquieu, deliberately divided power among three separate branches to prevent any single person or group from controlling the entire government. James Madison defended this design in Federalist No. 51, arguing that ambition must be made to counteract ambition. Each branch holds tools to limit the power of the others, a system known as checks and balances.

Congress writes laws but the President can veto them. The President negotiates treaties but the Senate must ratify them by a two-thirds vote. The President appoints federal judges but the Senate must confirm them. The Supreme Court can strike down laws it finds unconstitutional. Congress can impeach and remove the President or federal judges.

This three-branch structure has remained the backbone of American government for more than two centuries, though the relative power of each branch has shifted over time. Strong presidents such as Abraham Lincoln during the Civil War, Franklin Roosevelt during the Great Depression, and modern administrations have expanded executive authority. Landmark Supreme Court rulings have asserted judicial power. Congress has delegated and reclaimed authority through statutes such as the War Powers Resolution of 1973.

For citizenship applicants, knowing the three branches is foundational. Almost every other civics question builds on this framework, from how a bill becomes a law to who heads the federal courts.