The Supreme Court has interpreted the Fourteenth Amendment as a set of distinct guarantees, not a single promise of fairness. Its first section establishes birthright citizenship, protects privileges or immunities of U.S. citizens, bars states from depriving people of due process, and requires states to provide equal protection of the laws. Over time, the Court gave those clauses sharply different roles: equal protection became central to cases about racial equality and government classifications, while due process developed procedural, incorporation, and substantive-liberty doctrines. A 2026 citizenship decision reaffirmed that children born in the United States to parents unlawfully or temporarily present are citizens at birth.
What does Section One of the 14th Amendment do?
Section One contains four guarantees that answer different constitutional questions. The Citizenship Clause establishes citizenship for people born or naturalized in the United States and subject to its jurisdiction. The Privileges or Immunities Clause protects privileges or immunities of U.S. citizens. The Due Process Clause limits how a state may deprive a person of life, liberty, or property. The Equal Protection Clause requires a state to provide equal protection of the laws.
The distinction matters when reading a Supreme Court opinion. A case about whether someone is a citizen at birth raises a different question from a challenge to a state’s procedures, a government classification, or a law restricting a fundamental liberty. Some decisions invoke more than one clause, but that does not make the clauses interchangeable.
Section One is directed at state action. It restrains state governments; it is not, by itself, a general prohibition on every discriminatory act by a private person. Whether government action is involved is therefore an important threshold issue in a Fourteenth Amendment claim.
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How did the Court narrow the Privileges or Immunities Clause?
Slaughter-House Cases (1873)
In the Slaughter-House Cases, the Supreme Court considered a Louisiana law that granted a slaughterhouse monopoly. Butchers argued that the restriction interfered with their right to pursue their trade and that this right was a privilege of national citizenship protected by the Fourteenth Amendment.
The Court rejected that claim and read the Privileges or Immunities Clause as protecting a narrower set of rights associated with national citizenship, rather than the general civil rights of state citizenship. That interpretive choice sharply constrained the clause’s later reach. It is important to describe the result accurately: the Court limited how the clause would operate, but it did not erase the clause from the Constitution or hold that its text had no meaning.
The decision helps explain why many later landmark cases rely more visibly on due process or equal protection. It is a starting point for understanding the Court’s allocation of work among Section One’s guarantees, not a ruling that settled every question about rights or citizenship.
How did equal protection doctrine change from Plessy to Brown?
Plessy v. Ferguson (1896): segregation upheld
In Plessy v. Ferguson, the Court upheld state-mandated racial separation in railway accommodations under the “separate but equal” approach. The decision accepted segregation in that setting as consistent with equal protection, provided the facilities were treated as equal. It became the constitutional basis for a doctrine that permitted legally enforced racial separation.
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Brown v. Board of Education (1954): school segregation rejected
Brown v. Board of Education considered racial segregation in public schools. The Court held that legally imposed segregation in public education denied equal protection even if tangible facilities were equal. It concluded that the effect of segregation mattered and stated: “Separate educational facilities are inherently unequal.” (Chief Justice Earl Warren, opinion of the Court, Brown v. Board of Education, 347 U.S. 483, 495 (1954).)
Brown rejected Plessy’s rule in the field of public education. Its direct holding concerned public schools; the opinion should not be described as deciding every context involving segregation in a single stroke. The cases together show a major change in the Court’s treatment of racial separation: a doctrine that had permitted it in railway accommodations could not justify state-enforced segregation in public education.
How does the Court evaluate other equal-protection claims?
Equal protection applies when a state draws a distinction among people or groups. The Court uses different levels of review depending on the classification and the context. Rational-basis review is one part of that framework, but it is not a universal test for every dispute, and not every classification receives strict scrutiny. The question is what kind of government distinction is challenged and which constitutional standard applies to it.
Brown is the clearest example in this group of cases of the Court rejecting a racial classification in public schooling. Other equal-protection disputes may involve different classifications, different settings, and different doctrinal tests. A careful account should identify the challenged government action and the applicable level of review rather than assume that one test resolves all equal-protection cases.
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Voting and electoral districts
The Court has also applied equal-protection principles to voting and apportionment disputes. Under the “one person, one vote” principle, electoral districts are subject to an approximately equal-population requirement. The precise constitutional source and test can depend on whether the challenge concerns congressional districts or state legislative districts, so the governing case and type of district matter when assessing a particular dispute.
What does due process protect?
The Due Process Clause has developed along two distinct lines. Procedural due process asks whether the government used fair procedures before depriving a person of life, liberty, or property. Substantive due process asks a different question: whether the government may infringe certain fundamental liberties at all, even if it follows fair procedures. A claim that procedures were inadequate is not the same as a claim that a law impermissibly restricts a protected liberty.
Incorporation: applying many Bill of Rights protections to states
The Supreme Court has also used the Fourteenth Amendment’s Due Process Clause to apply many protections in the Bill of Rights to state governments. This process is commonly called incorporation. It developed over time and is generally considered guarantee by guarantee. It is therefore inaccurate to say that one decision made the entire Bill of Rights applicable to states at once.
In a case involving a particular Bill of Rights protection, the relevant question is whether that guarantee has been incorporated against the states and how the Court has interpreted it. Incorporation is one of due process’s major roles, but it should not be confused with procedural due process in an individual dispute or with equal protection’s focus on government distinctions.
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Substantive liberty and its contested history
The Court’s substantive due-process approach has not been uniform. In the early twentieth century, the Court used it to protect economic liberty, then later retreated from that approach. It has continued to recognize some non-economic fundamental rights, but the existence of a due-process claim does not establish that every asserted liberty is constitutionally protected. The history is contested, and the Court’s treatment depends on the liberty at issue and the doctrine applied in the case.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How do due process and equal protection work together in marriage cases?
Loving v. Virginia (1967)
In Loving v. Virginia, the Court invalidated state bans on interracial marriage under both the Equal Protection Clause and the Due Process Clause. The case is a clear example of a decision relying on both guarantees: the state’s racial restrictions implicated equality, while the right to marry implicated liberty. The two grounds mattered to the result without becoming one doctrine.
Obergefell v. Hodges (2015)
In Obergefell v. Hodges, the Court held that same-sex couples have the right to marry under the Fourteenth Amendment. Justice Anthony M. Kennedy’s majority opinion explained how the two clauses relate: “The Due Process Clause and the Equal Protection Clause are connected in a profound way, though they set forth independent principles.” (Obergefell v. Hodges, 576 U.S. 644 (2015).)
The formulation is useful because it explains how liberty and equality can inform one another without collapsing into the same question. Due process and equal protection remained independent principles in the Court’s analysis, even as the opinion treated them as mutually informative in recognizing the right at issue.
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What did the Supreme Court decide about birthright citizenship in 2026?
Trump v. Barbara (June 30, 2026)
In Trump v. Barbara, No. 25-365, the Court held that children born in the United States to parents unlawfully or temporarily present are subject to U.S. jurisdiction and citizens at birth under the Citizenship Clause. Chief Justice John G. Roberts Jr.’s opinion described the clause in relation to the common-law rule and relied on United States v. Wong Kim Ark. Roberts wrote: “Children born in the United States to parents unlawfully or temporarily present are thus subject to the Nation’s jurisdiction.” (Trump v. Barbara, slip opinion, at 12.)
The holding addresses children born in the United States in the specified parental circumstances. It should not be generalized into a resolution of every question about citizenship. The Supreme Court’s opinion index notes that slip opinions may later be edited before publication in the U.S. Reports, so the June 30, 2026, slip opinion is the relevant form of the decision for this account.
How to read a Fourteenth Amendment Supreme Court case
For any case, start with the clause the Court applies, then identify the government action being challenged. Next ask what doctrine or method the opinion uses, whether the decision narrows, extends, or rejects earlier law, and how far its holding reaches. That last step prevents a ruling about one setting—such as public education—from being overstated as a decision about every setting.
- Citizenship: identify the birth or naturalization circumstances and the question of jurisdiction.
- Privileges or Immunities: note whether the asserted right is treated as one tied to national citizenship or as a broader civil right.
- Equal protection: identify the state classification, context, and level of review.
- Due process: distinguish a procedural fairness claim, an incorporation question, and a substantive-liberty claim.
- Multiple clauses: keep each clause’s reasoning distinct even when the Court uses them together, as it did in the marriage cases.
These distinctions make the Amendment’s history easier to follow: the Court gave the Privileges or Immunities Clause a narrow construction early on; equal protection became a major basis for addressing racial segregation and other state classifications; and due process developed into a source of procedure, incorporated protections, and some fundamental-liberty rights. The clauses’ roles have changed through cases with particular facts and holdings, rather than through one all-purpose interpretation.
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