Freedom of movement under United States law is governed primarily by the Privileges and Immunities Clause of the United States Constitution which states, "The Citizens of each State shall be entitled to all Privileges and Immunities of Citizens in the several States." As far back as the circuit court ruling in Corfield v. Coryell, 6 Fed. Cas. 546 (1823), the Supreme Court recognized freedom of movement as a fundamental Constitutional right. In Paul v. Virginia, 75 U.S. 168 (1869), the Court defined freedom of movement as "right of free ingress into other States, and egress from them." However, the Supreme Court did not invest the federal government with the authority to protect freedom of movement. Under the "privileges and immunities" clause, this authority was given to the states, a position the Court held consistently through the years in cases such as Ward v. Maryland, 79 U.S. 418 (1871), the Slaughter-House Cases, 83 U.S. 36 (1873) and United States v. Harris, 106 U.S. 629 (1883).

Freedom of movement under United States law is governed primarily by the Privileges and Immunities Clause of the United States Constitution which states, "The Citizens of each State shall be entitled to all Privileges and Immunities of Citizens in the several States." As far back as the circuit court ruling in Corfield v. Coryell, 6 Fed. Cas. 546 (1823), the Supreme Court recognized freedom of movement as a fundamental Constitutional right. In Paul v. Virginia, 75 U.S. 168 (1869), the Court defined freedom of movement as "right of free ingress into other States, and egress from them." However, the Supreme Court did not invest the federal government with the authority to protect freedom of movement. Under the "privileges and immunities" clause, this authority was given to the states, a position the Court held consistently through the years in cases such as Ward v. Maryland, 79 U.S. 418 (1871), the Slaughter-House Cases, 83 U.S. 36 (1873) and United States v. Harris, 106 U.S. 629 (1883).