The Fourteenth Amendment changed American governance by placing national citizenship above state citizenship, forcing state governments to honor the Bill of Rights and treat people equally under the law, and giving Congress the power to enforce those guarantees through federal legislation. Ratified on July 9, 1868, three years after the Civil War ended, it rewired the relationship between individuals, states, and the federal government in ways that still shape nearly every major civil rights ruling today.1National Archives. 14th Amendment to the U.S. Constitution: Civil Rights (1868)
National Citizenship Above the States
Before 1868, citizenship was mostly a state-level concept. The Constitution had no federal definition of who counted as a citizen, and that silence let the Supreme Court rule in Dred Scott v. Sandford (1857) that people of African descent could never be citizens of the United States, whether free or enslaved.2National Archives. Dred Scott v. Sandford (1857)
Section 1 erased that ruling. Anyone born or naturalized in the United States, and subject to its jurisdiction, is a citizen of both the nation and the state where they reside.3Constitution Annotated. Civil War Amendments (Thirteenth, Fourteenth, and Fifteenth Amendments) The order matters. People now derive their primary citizenship from the United States itself, not from whatever state they happen to live in, and states lost the ability to define who belongs.
Later decisions locked that in. In Afroyim v. Rusk (1967), the Supreme Court held that Congress has no power to strip a person of citizenship without their voluntary consent, treating citizenship as a constitutional right the government cannot forcibly destroy.4Legal Information Institute. Afroyim v. Rusk, 387 U.S. 253
Making the Bill of Rights Apply to States
The Bill of Rights, adopted in 1791, restricted only the federal government. States were free to limit speech, conduct unreasonable searches, or deny jury trials without violating the Constitution. The Fourteenth Amendment’s Due Process Clause changed that by prohibiting states from depriving any person of life, liberty, or property without due process of law.1National Archives. 14th Amendment to the U.S. Constitution: Civil Rights (1868)
Over the twentieth century, the Supreme Court used that clause to “incorporate” nearly every protection in the Bill of Rights against state governments. Freedom of speech became enforceable against states after Gitlow v. New York in 1925. Protection against unreasonable searches followed in Mapp v. Ohio in 1961. The Second Amendment right to keep and bear arms was incorporated in McDonald v. City of Chicago in 2010.5Justia. McDonald v. City of Chicago, 561 U.S. 742 (2010) As recently as 2019, the Court incorporated the Eighth Amendment’s ban on excessive fines in Timbs v. Indiana.
The practical result is that the constitutional protections most people know apply the same way whether the government violating them is federal, state, or local. That was not true before the Fourteenth Amendment.
Unenumerated Rights Under the Due Process Clause
The Due Process Clause did something its framers likely never envisioned: it became the basis for protecting fundamental rights that appear nowhere in the Constitution’s text. Under the doctrine of substantive due process, the word “liberty” in the amendment covers certain deeply rooted rights that government cannot violate no matter how fair its procedures are.
That doctrine has produced some of the most consequential rulings in American history. In Griswold v. Connecticut (1965), several justices relied on the Fourteenth Amendment to strike down a state ban on contraceptives, recognizing a right to marital privacy. In Loving v. Virginia (1967), the Court used both the Due Process and Equal Protection Clauses to invalidate state bans on interracial marriage, calling the freedom to marry a fundamental right.6Justia. Loving v. Virginia, 388 U.S. 1 (1967) In Obergefell v. Hodges (2015), the Court extended that reasoning to hold that same-sex couples have a constitutional right to marry under the Fourteenth Amendment.7Justia. Obergefell v. Hodges, 576 U.S. 644 (2015)
Substantive due process remains contested. In Dobbs v. Jackson Women’s Health Organization (2022), the Court overruled Roe v. Wade and held that the Fourteenth Amendment does not protect a right to abortion, concluding that any unenumerated right must be “deeply rooted in this Nation’s history and tradition” to qualify for protection.8Supreme Court of the United States. Dobbs v. Jackson Women’s Health Organization Which rights meet that standard is one of the defining disagreements in modern constitutional law, but the larger fact is settled: through the Due Process Clause, the Supreme Court has recognized liberties well beyond anything the Bill of Rights lists.
Equal Protection and How Courts Apply It
The Equal Protection Clause requires every state to provide equal protection of the laws to all people within its jurisdiction.1National Archives. 14th Amendment to the U.S. Constitution: Civil Rights (1868) On paper, that should have ended state-sponsored racial discrimination in 1868. In practice, the Supreme Court gutted the clause in Plessy v. Ferguson (1896), upholding racial segregation on the theory that separate facilities were consistent with equal protection so long as they were ostensibly equal.9U.S. Courts. History – Brown v. Board of Education Re-enactment
That fiction held for nearly sixty years. In Brown v. Board of Education (1954), the Court unanimously declared that separate educational facilities are inherently unequal and that state-mandated school segregation violated the Fourteenth Amendment.10National Archives. Brown v. Board of Education (1954) From there, the Equal Protection Clause became the basis for dismantling segregation across nearly every government-run institution.
Courts now apply different levels of scrutiny when deciding whether a law violates equal protection, depending on the type of classification at issue:
- Strict scrutiny applies to laws that classify people by race or national origin. The government must prove the law serves a compelling interest and is the least restrictive way to achieve it. Very few laws survive this test.
- Intermediate scrutiny applies to classifications based on gender or legitimacy. The law must serve an important government interest and be substantially related to achieving it.
- Rational basis review applies to most other classifications. The law needs only a rational connection to a legitimate government purpose, and laws reviewed under this standard are almost always upheld.
The whole framework flows from the Equal Protection Clause and the case law built on it since Brown. When you read about a court striking down or upholding a state law that treats groups differently, this is the machinery doing the work.
Congressional Power to Enforce Civil Rights
Section 5 gave Congress the power to enforce the amendment’s protections through legislation.3Constitution Annotated. Civil War Amendments (Thirteenth, Fourteenth, and Fifteenth Amendments) Before 1868, Congress had limited authority to regulate how states treated their own residents. Section 5 created the constitutional basis for federal civil rights laws.
One of the earliest was the Civil Rights Act of 1871, passed in response to Ku Klux Klan violence against Black citizens across the South. It authorized the president to suspend habeas corpus and deploy the military to suppress organized attacks on constitutional rights when state governments would not or could not act.11National Park Service. Protecting Life and Property: Passing the Ku Klux Klan Act The same 1871 Act created a legal remedy that remains one of the most widely used tools in civil rights law: the ability for individuals to sue state officials who violate their constitutional rights. That provision, now codified as 42 U.S.C. § 1983, is the basis for nearly every modern lawsuit against police officers, corrections officials, and other government actors for civil rights violations.
Congress’s Section 5 power has limits. In City of Boerne v. Flores (1997), the Supreme Court held that any law Congress passes under Section 5 must show “congruence and proportionality” between the constitutional violation being addressed and the remedy Congress chose.12Legal Information Institute. City of Boerne v. Flores Congress can enforce the Fourteenth Amendment, but it cannot use Section 5 to redefine or expand what the amendment substantively means.
Representation, Disqualification, and the Public Debt
The remaining sections of the amendment reshaped governance in narrower but still meaningful ways.
Section 2 ended the original Constitution’s three-fifths compromise by requiring that congressional representation be based on the whole number of persons in each state.13Legal Information Institute. Fourteenth Amendment – Apportionment Clause It also included a penalty: if a state denied or restricted the right to vote for eligible male citizens, its congressional representation would be reduced proportionally.14Legal Information Institute. 14th Amendment That penalty was never enforced despite widespread voter suppression across the South, but the provision established for the first time that a state’s representation was constitutionally linked to whether it actually let its people vote. The gendered language reflected the era; the Nineteenth Amendment later extended voting rights to women.
Section 3 barred anyone from holding federal or state office if they had previously sworn an oath to support the Constitution and then participated in insurrection or rebellion. The provision targeted former Confederate officials who had served in the U.S. government before the war.1National Archives. 14th Amendment to the U.S. Constitution: Civil Rights (1868) Congress can remove the disqualification by a two-thirds vote in each chamber, and it eventually did so for most former Confederates during Reconstruction. Section 3 was largely dormant for 150 years until Trump v. Anderson (2024), where the Supreme Court unanimously held that states cannot enforce it against federal candidates on their own. Only Congress has that authority, the Court reasoned, because Section 5 places enforcement power in congressional hands.15Legal Information Institute. Trump v. Anderson and Enforcement of the Insurrection Clause (Disqualification Clause)
Section 4 declared that the validity of the public debt of the United States shall not be questioned, and prohibited the federal government or any state from paying debts incurred to support the Confederacy or compensating former slaveholders.16Constitution Annotated. Fourteenth Amendment The Supreme Court has read the clause more broadly than its Civil War origins, treating it as a protection for the integrity of all federal financial commitments.17Constitution Annotated. Overview of Public Debt Clause Some legal scholars and policymakers have argued that Section 4 makes the federal debt ceiling constitutionally suspect because it prohibits allowing default on existing obligations. No court has ruled on that question directly, and debt ceiling standoffs have so far been resolved through legislation rather than constitutional confrontation. That a provision written to settle Civil War finances is now invoked in twenty-first-century fiscal debates says something about the amendment as a whole: its framers wrote in broad language, and American governance is still working out what that language requires.