What are the three types of powers in our system?

The three types of powers in the American constitutional system are legislative, executive, and judicial, each vested in a separate branch of the federal government. The Constitution allocates these powers in its first three articles. Article I gives Congress the legislative power, the authority to make federal laws, raise revenue, regulate interstate and foreign commerce, declare war, and so on through the eighteen clauses of Article I, Section 8. Congress is divided into a Senate of 100 members with two senators from each state and a House of Representatives of 435 members apportioned by population.

Article II gives the president the executive power, the authority to enforce federal laws, command the military, conduct foreign relations, negotiate treaties, nominate officials, and grant pardons. The president serves a four-year term, limited to two terms by the Twenty-Second Amendment ratified in 1951.

Article III gives the federal courts the judicial power, the authority to interpret federal laws, decide cases and controversies, and apply the Constitution. Article III judges hold office during good behavior after presidential nomination and Senate confirmation, a tenure that effectively lasts for life and protects judicial independence from political swings.

The three powers correspond to three distinct functions of government: making law, executing law, and interpreting law. The Founders deliberately separated them based on the work of Charles-Louis de Secondat, Baron de Montesquieu, whose 1748 book The Spirit of the Laws argued that liberty could not exist when these three powers were combined in the same hands. James Madison cited Montesquieu in Federalist No. 47 in 1788, calling the accumulation of all three powers in the same body the very definition of tyranny.

The branches do not operate in isolation. Checks and balances let each branch limit the others. The president can veto legislation; Congress can override the veto. The Senate confirms appointments and ratifies treaties. Courts can strike down unconstitutional laws or executive actions through judicial review, established in Marbury v. Madison in 1803. Congress can impeach and remove federal judges and the president. Federalism adds a vertical division of powers between the national government and the fifty states, further dispersing authority.