Lesson 1 of 5
Separation of Powers: Three Branches, Three Jobs
Why the Framers divided legislative, executive and judicial power.
The text
All legislative Powers herein granted shall be vested in a Congress of the United States, which shall consist of a Senate and House of Representatives.
The executive Power shall be vested in a President of the United States of America. He shall hold his Office during the Term of four Years, and, together with the Vice President, chosen for the same Term, be elected, as follows
Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress: but no Senator or Representative, or Person holding an Office of Trust or Profit under the United States, shall be appointed an Elector.
The Electors shall meet in their respective States, and vote by Ballot for two Persons, of whom one at least shall not be an Inhabitant of the same State with themselves. And they shall make a List of all the Persons voted for, and of the Number of Votes for each; which List they shall sign and certify, and transmit sealed to the Seat of the Government of the United States, directed to the President of the Senate. The President of the Senate shall, in the Presence of the Senate and House of Representatives, open all the Certificates, and the Votes shall then be counted. The Person having the greatest Number of Votes shall be the President, if such Number be a Majority of the whole Number of Electors appointed; and if there be more than one who have such Majority, and have an equal Number of Votes, then the House of Representatives shall immediately chuse by Ballot one of them for President; and if no Person have a Majority, then from the five highest on the List the said House shall in like Manner chuse the President. But in chusing the President, the Votes shall be taken by States, the Representation from each State having one Vote; A quorum for this Purpose shall consist of a Member or Members from two thirds of the States, and a Majority of all the States shall be necessary to a Choice. In every Case, after the Choice of the President, the Person having the greatest Number of Votes of the Electors shall be the Vice President. But if there should remain two or more who have equal Votes, the Senate shall chuse from them by Ballot the Vice President.
The Congress may determine the Time of chusing the Electors, and the Day on which they shall give their Votes; which Day shall be the same throughout the United States.
No Person except a natural born Citizen, or a Citizen of the United States, at the time of the Adoption of this Constitution, shall be eligible to the Office of President; neither shall any Person be eligible to that Office who shall not have attained to the Age of thirty five Years, and been fourteen Years a Resident within the United States.
In Case of the Removal of the President from Office, or of his Death, Resignation, or Inability to discharge the Powers and Duties of the said Office, the Same shall devolve on the Vice President, and the Congress may by Law provide for the Case of Removal, Death, Resignation or Inability, both of the President and Vice President, declaring what Officer shall then act as President, and such Officer shall act accordingly, until the Disability be removed, or a President shall be elected.
The President shall, at stated Times, receive for his Services, a Compensation, which shall neither be encreased nor diminished during the Period for which he shall have been elected, and he shall not receive within that Period any other Emolument from the United States, or any of them.
Before he enter on the Execution of his Office, he shall take the following Oath or Affirmation:—"I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States."
The judicial Power of the United States, shall be vested in one supreme Court, and in such inferior Courts as the Congress may from time to time ordain and establish. The Judges, both of the supreme and inferior Courts, shall hold their Offices during good Behaviour, and shall, at stated Times, receive for their Services, a Compensation, which shall not be diminished during their Continuance in Office.
The powers of the Government shall be divided into three distinct departments: Legislative, Executive, and Judicial.
No person or persons belonging to one of these departments shall exercise any of the powers properly belonging to either of the others, except in the cases herein directed or permitted.
The powers of the government of this state are divided into three distinct departments,--the legislative, executive and judicial; and no person or collection of persons charged with the exercise of powers properly belonging to one of these departments shall exercise any power properly belonging to either of the others, except as in this constitution expressly directed or permitted.
The design
The Constitution's first three articles each create one branch:
- Article I: Congress makes the laws ("All legislative Powers herein granted").
- Article II: The President executes the laws ("The executive Power").
- Article III: The courts decide cases under the laws ("The judicial Power").
Each branch is chosen differently (House by the people every two years, Senators for six-year terms, the President by electors every four years, judges by nomination and Senate confirmation for good behavior), so no single faction can easily capture all three at once.
Why the Framers did it
The Framers believed human nature does not change with a title. Madison wrote in The Federalist No. 47: "The accumulation of all powers, legislative, executive, and judiciary, in the same hands, whether of one, a few, or many, and whether hereditary, self-appointed, or elective, may justly be pronounced the very definition of tyranny." He relied on Montesquieu: "The oracle who is always consulted and cited on this subject is the celebrated Montesquieu." In No. 51 (published as "Publius" and generally attributed to Madison) he added: "But what is government itself, but the greatest of all reflections on human nature? If men were angels, no government would be necessary."
In our reading, the design reflects the biblical view of human nature widely shared in the founding era: man is capable of self-government but also prone to sin, so government is necessary, yet its power must be divided because no one can be trusted with all of it.
In your state
State constitutions follow the same pattern, often more explicitly. Tennessee's Article II, Sections 1 and 2 divide government into "three distinct departments: Legislative, Executive, and Judicial" and forbid anyone in one from exercising the powers of another, "except in the cases herein directed or permitted." Colorado's Article III says the same in a single sentence.
Why it matters today
When an agency writes rules with the force of law, or a court decides policy questions the Constitution leaves to the people, the separation of powers is at stake. In Loper Bright Enterprises v. Raimondo, 603 U.S. 369 (2024), the Supreme Court overruled the Chevron doctrine. It held that the Administrative Procedure Act requires courts to "exercise their independent judgment in deciding whether an agency has acted within its statutory authority," and that courts may not defer to an agency's reading of the law simply because a statute is ambiguous.
Check your understanding
This lesson is educational and is not legal advice. Laws and procedures change; confirm current rules with the official sources linked above.