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Constitutional Amendments

The Constitution contains within itself the process for changing it. The amendment process is described in Article 5. Amendments can be proposed in Congress when 2/3rd of both Houses agree. The states can play a role in proposing changes to the Constitution as well: 2/3rds of the state legislatures must call Conventions to propose amendments. Whether amendments are first proposed by the states or Congress, 3/4ths of the states must ratify (or approve) them before they become a part of the Constitution—the Supreme law of the land. 
The Constitution, with its 27 amendments, has been amended only 17 times since the first 10—which make up the Bill of Rights—were ratified in 1791. [Bill of Rights Institute]

Bill of Rights

Amendments 11 - 27