The Fourteenth Amendment was originally written to ensure that freed slaves would be treated as citizens, but, in the twentieth century, the Supreme Court used the amendment's Equal Protection and Due Process Clauses to expand the protections provided in the Bill of Rights to the states. This concept of extending, called incorporation, means that the federal government uses the Fourteenth Amendment and the Bill of Rights to address limitations on liberty by states against their citizens. This lesson explores the significance of this amendment and incorporation and its effects on our constitutional structure.