The first changes to the Constitution were made to protect individual citizens and to limit the power of government. The Bill of Rights lists important freedoms that are promised to the American people. In most instances, these rights limit what government can do to individual people. These rights include:
The U.S. Constitution is called a “living document” because the American people, acting through their state and national representatives, can change it when necessary. These changes are called “amendments.” It is a long and difficult process to change the Constitution, so it has been changed only 27 times over the course of our history. Besides the Bill of Rights, some important amendments are the Thirteenth, which forbids slavery, and the Fourteenth, which guarantees all citizens equal protection under the law. The Nineteenth Amendment gives women the right to vote.
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Citation: U.S. Department of Homeland Security, U.S. Citizenship and Immigration Services, Office of Citizenship, Welcome to the United States: A guide for New Immigrants, Washington, DC, 2007, Revised Edition.