The Bill of Rights, including the Second Amendment, originally applied only to the Federal Government, not to the States, see, e.g., Barron ex rel. Tiernan v. Mayor of Baltimore, 7 Pet. 243, 247, but the constitutional Amendments adopted in the Civil War’s aftermath fundamentally altered the federal system. Four years after the adoption of the Fourteenth Amendment, this Court held in the SlaughterHouse Cases, that the Privileges or Immunities Clause protects only those rights “which owe their existence to the Federal government, its National character, its Constitution, or its laws,” 16 Wall., at 79, and that the fundamental rights predating the creation of the Federal Government were not protected by the Clause, id., at 76. Under this narrow reading, the Court held that the Privileges or Immunities Clause protects only very limited rights. Id., at 79–80. Subsequently, the Court held that the Second Amendment applies only to the Federal Government in Cruikshank, 92 U. S. 542, Presser, 116
S. 252, and Miller, 153 U. S. 535, the decisions on which the Seventh Circuit relied in this case. Pp. 5–9.