The Slaughter-House Cases, 83 U.S. 36 (1873), was a landmark U.S. Supreme Court decision which ruled that the Privileges or Immunities Clause of the Fourteenth Amendment to the U.S. Constitution only protects the legal rights that are associated with federal U.S. citizenship, not those that pertain to state citizenship. Though the decision in the Slaughter-House Cases minimized the impact of the Privileges or Immunities Clause on state law, the Supreme Court would later incorporate the Bill of Rights to strike down state laws on the basis of other clauses. In 2010, the Court rejected arguments in McDonald v. Chicago to overrule the established precedent of Slaughterhouse and decided instead to incorporate the Second Amendment via the Due Process Clause of the Fourteenth Amendment.

The Fourteenth Amendment to the United States Constitution was adopted on July 9, 1868, as one of the Reconstruction Amendments. Usually considered one of the most consequential amendments, it addresses citizenship rights and equal protection under the law and was proposed in response to issues related to formerly enslaved Americans following the American Civil War. The amendment was bitterly contested, particularly by the states of the defeated Confederacy, which were forced to ratify it in order to regain representation in Congress. The amendment, particularly its first section, is one of the most litigated parts of the Constitution, forming the basis for landmark Supreme Court decisions such as Brown v. Board of Education (1954) regarding racial segregation, Loving v. Virginia (1967) regarding interracial marriage, Roe v. Wade (1973) regarding abortion, Bush v. Gore (2000) regarding the 2000 presidential election, Obergefell v. Hodges (2015) regarding same-sex marriage, and Students for Fair Admissions v. Harvard (2023) regarding race-based college admissions. The amendment limits the actions of all state and local officials, and also those acting on behalf of such officials.