The US Constitution and Bill of Rights explained
Understand how the Constitution was written, the three branches of government, checks and balances and the first ten amendments.
Middle SchoolHigh SchoolAPCurriculum fit: US middle and high school civics and US History; AP US History and Government. Not part of UK GCSE History core content.
On this page
What is it?
The US Constitution is the supreme law of the United States. It was written at the Philadelphia Convention in 1787 to replace the weak Articles of Confederation. It sets up the structure of government and the powers of each branch.
The Bill of Rights is the first ten amendments to the Constitution. It protects the individual rights and freedoms of citizens from government interference.
Key formulas and ideas
- Three branches: legislative (Congress makes laws), executive (the President enforces them) and judicial (the courts interpret them).
- Checks and balances: each branch can limit the power of the others.
- Federalism: power is shared between the national government and the states.
- The Bill of Rights: the first ten amendments, ratified in 1791.
Worked examples
Example 1: Checks and balances
Question: Give one way the President can check Congress and one way Congress can check the President.
- The President can veto a bill passed by Congress.
- Congress can override a veto with a two-thirds vote in both houses.
Answer: Veto; override of a veto by two-thirds of Congress
Example 2: First Amendment
Question: Name the freedoms protected by the First Amendment.
- Religion, speech and the press.
- The right to assemble peacefully and to petition the government.
Answer: Religion, speech, press, assembly and petition
Example 3: Ratifying the Bill of Rights
Question: How many amendments did Congress propose in 1789, and how many were ratified as the Bill of Rights?
- The National Archives notes that Congress proposed twelve amendments in 1789.
- Ten were ratified by the states in 1791 as the Bill of Rights.
Answer: Twelve proposed, ten ratified
Common mistakes
- Confusing the Constitution with the Declaration of Independence.
- Saying the Bill of Rights was part of the original Constitution.
- Mixing up the roles of the branches.
- Forgetting that states also have powers.
Practice questions
Frequently asked questions
Why was the Bill of Rights added?
Many people worried the original Constitution did not do enough to protect individual liberties, so amendments were added as a condition for support in some states.
How can the Constitution be changed?
Through amendments, which require approval by two-thirds of Congress and ratification by three-fourths of the states.
Related guides
The Civil Rights Movement: key events, laws and leaders
Follow the struggle against segregation in the United States, from Brown v. Board of Education to the Civil Rights Act and Voting Rights Act.
Middle SchoolHigh SchoolAPThe Industrial Revolution: causes, inventions and effects
Find out why the Industrial Revolution began in Britain, how factories and steam power changed life and what reforms followed.
KS3GCSEMiddle SchoolHigh School+1The Cold War: causes, key events and how it ended
Understand the rivalry between the US and the Soviet Union from 1945 to 1991, with key events such as the Berlin Wall and the Cuban Missile Crisis.
GCSEA-LevelHigh SchoolAPSources and review
Reviewed by StudyMorrow editorial review on 5 Nov 2026.