The Constitutional Amendments form the living part of the US Constitution — 27 changes ratified over 231 years, from the Bill of Rights (1791) to the 27th Amendment (1992). Search by topic, filter by era, or jump directly to any amendment by number.
Jump to Amendment
Ratified December 15, 1791. The first 10 amendments protect fundamental individual rights against federal government overreach. Proposed by James Madison in response to anti-Federalist concerns about the new Constitution.
How to Use the Constitutional Amendments Reference
The Constitutional Amendments reference gives you instant access to all 27 amendments with plain-English explanations, historical context, and key Supreme Court cases. Whether you're studying for a civics exam, researching a legal question, or just curious about a specific right, here's how to find what you need.
Searching by Topic
The search box scans amendment titles, plain-English explanations, and historical context. Some useful search terms: "speech" finds the 1st Amendment; "gun" or "arms" finds the 2nd; "slavery" finds the 13th; "vote" finds the 15th, 19th, 24th, and 26th; "income tax" finds the 16th; "Prohibition" finds the 18th and 21st; "president" finds the 20th, 22nd, and 25th.
Era Filter
The amendments fall into four historical groups. The Bill of Rights (1-10, 1791) established foundational individual rights. Reconstruction amendments (13-15, 1865-1870) abolished slavery and extended civil rights after the Civil War. Progressive Era amendments (16-19, 1913-1920) addressed income taxes, Senate elections, Prohibition, and women's suffrage. Modern amendments (20-27, 1933-1992) cover presidential succession, term limits, voting age, DC representation, and congressional pay.
Expanding Amendment Details
Click any amendment card to expand the full details: the constitutional text (paraphrased), historical context explaining why the amendment was needed, and notable Supreme Court cases that shaped how the amendment is interpreted today. The 1st Amendment alone has generated thousands of Supreme Court decisions — we highlight 2-3 landmark cases for each amendment.
Color Coding
Each amendment card has a left-border color indicating its era: purple for the Bill of Rights, green for Reconstruction, blue for Progressive Era, and red for Modern. This helps you visually identify amendments by historical period when browsing the full list.
FAQ
Is this Constitutional amendments reference free?
Yes, completely free. No account, no signup, no fees. All content runs locally in your browser.
How many amendments are there to the US Constitution?
There are 27 amendments to the US Constitution. The first 10, known as the Bill of Rights, were ratified together in 1791. The 27th amendment (congressional pay raises) was ratified in 1992 — 203 years after it was first proposed by James Madison.
What is the Bill of Rights?
The Bill of Rights refers to the first 10 amendments to the US Constitution, ratified on December 15, 1791. They were added to address concerns that the original Constitution did not sufficiently protect individual rights against the new federal government. They cover freedom of speech, religion, press, assembly, the right to bear arms, quartering of soldiers, unreasonable search and seizure, self-incrimination, due process, and states' rights.
What does the 1st Amendment protect?
The First Amendment protects five fundamental freedoms: religion (no established state religion; free exercise of religion), speech, press, peaceful assembly, and the right to petition the government for redress of grievances. It applies to government restrictions — private companies can restrict speech on their own platforms.
Which amendment abolished slavery?
The 13th Amendment, ratified on December 6, 1865, abolished slavery and involuntary servitude except as punishment for a crime. It was ratified eight months after the Civil War ended and several months after Lincoln's assassination.
Can the Constitution be amended today?
Yes. A constitutional amendment requires either a two-thirds vote in both houses of Congress followed by ratification by three-fourths (38) of state legislatures, or a constitutional convention called by two-thirds of state legislatures. The last amendment (27th) was ratified in 1992.
What is the most recent amendment?
The 27th Amendment (1992) prevents members of Congress from giving themselves mid-term pay raises — any pay change takes effect only after the next congressional election. It was originally proposed by James Madison in 1789 as part of the original Bill of Rights package but wasn't ratified until 1992.
Can I search for a specific amendment?
Yes. The search box searches across amendment titles, plain-English explanations, and historical context. Try searching 'speech', 'gun', 'slavery', 'vote', or 'taxes' to find relevant amendments quickly. You can also use the category filter (Bill of Rights, Reconstruction, Progressive Era, Modern) or click the numbered buttons 1-27 for direct navigation.