Britannica
Sources used in this answer
- Constitution of the United States of America - List of amendments to the U.S. Constitution
- Bill of Rights
- Text of the Constitution of the United States - Ninth Amendment
- Text of the Constitution of the United States - First Amendment
- Text of the Constitution of the United States - Tenth Amendment
- amendment
- Text of the Constitution of the United States - Section 2
- list of amendments to the U.S. Constitution
- What is a constitutional amendment?
How many amendments have been added to the United States Constitution?
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Constitution of the United States of America
Original copy of the U.S. Constitution, housed in the National Archives in Washington, D.C.
There have been 27 amendments added to the United States Constitution. The first 10 amendments, known as the Bill of Rights, were ratified in 1791. Subsequent amendments have addressed various aspects of governance and individual rights, including the abolition of slavery, voting rights, and presidential term limits. For an amendment to be adopted, it must be approved by two-thirds of both houses of Congress and ratified by three-fourths of the states.12345