====== Fourteenth Amendment - Legal Consensus ======

===== Lede =====

The Fourteenth Amendment to the United States Constitution, ratified in 1868, is one of the most heavily litigated provisions in American constitutional law. Its first section establishes national citizenship, and bars states from abridging the "privileges or immunities" of citizens, depriving any person of "life, liberty, or property, without due process of law," or denying "equal protection of the laws."

Legal consensus regarding the Fourteenth Amendment is **mixed and uneven across doctrinal areas**. Among American constitutional scholars and jurists, broad agreement exists on three propositions: (1) the [[fourteenth-amendment-slaughter-house-cases-controversy|Slaughter-House Cases]] (1873) construed the Privileges or Immunities Clause too narrowly to be defensible on the original text or history; (2) the Due Process Clause incorporates most, though not all, of the Bill of Rights against the states ([[fourteenth-amendment-selective-incorporation-doctrine-viewpoint|selective incorporation]]); and (3) the Equal Protection Clause requires heightened judicial scrutiny of certain government classifications, organized into tiers. Beyond these points, **deep and unresolved disagreement** persists over foundational questions: what should fill the interpretive space left by Slaughter-House's evisceration of Privileges or Immunities; whether "substantive due process" is textually or historically defensible at all; and how far equal protection and due process extend into questions not enumerated in the constitutional text, such as classifications based on sex, sexual orientation, or transgender status. This is a case of partial consensus on doctrinal description coexisting with sharp, often unresolved disagreement on doctrinal justification and scope.

===== Evidence Base =====

==== Citizenship and incorporation ====

Constitutional scholars and the courts agree without serious dispute that the Citizenship Clause overturned [[dred-scott-v-sandford-history|Dred Scott v. Sandford]] (1857) by establishing that birth or naturalization in the United States, combined with subjection to U.S. jurisdiction, confers citizenship.((1))

There is also broad agreement, documented across legal reference sources maintained by the Library of Congress and Cornell Law School, that the Supreme Court has incorporated most individual Bill of Rights provisions against the states through the Due Process Clause, via a doctrine that developed case by case from the 1920s through the 1960s.((2)) This is known as selective incorporation: the Court has held a given right binding on the states by examining each provision individually, rather than adopting Justice Hugo Black's "total incorporation" position that all of the first eight amendments apply automatically and identically.((3)) No Justice has ever commanded a majority for total incorporation; Justice William Douglas calculated that ten Justices across the Court's history had endorsed it individually, but never as a contemporaneous majority.((4)) A small number of Bill of Rights provisions, including the Third Amendment and the grand jury indictment requirement of the Fifth Amendment, remain unincorporated.

==== Slaughter-House and the Privileges or Immunities Clause ====

There is unusually broad cross-ideological agreement among American legal scholars that the Slaughter-House Cases (1873) were wrongly decided as a matter of constitutional interpretation. Constitutional law scholar Akhil Amar has stated that virtually no serious modern scholar across the political spectrum views the decision as a plausible reading of the amendment.((5)) Justice Clarence Thomas, surveying the academic literature in his Saenz v. Roe dissent, observed that legal scholars agree on little beyond the conclusion that the Privileges or Immunities Clause does not mean what the Court held it to mean in 1873.((6)) Legal historian Kermit Roosevelt III has characterized this point as settled academic consensus, while noting that scholars disagree sharply over what would follow if the clause were revived.((7)) This agreement concerns the correctness of the 1873 holding, not what doctrine should replace it; see Limits and Open Questions below.

==== Equal protection and tiered scrutiny ====

Legal reference sources and case-law compilations describe consistent doctrinal structure: courts apply one of three tiers of judicial scrutiny to equal protection claims, depending on the classification at issue. Strict scrutiny, requiring a compelling government interest pursued through narrowly tailored means, applies to classifications based on race, national origin, religion, or alienage.((8)) Intermediate scrutiny, first articulated in Craig v. Boren (1976), applies to sex-based and illegitimacy-based classifications and requires a substantial relationship to an important government interest.((9)) Rational basis review, the default and most deferential standard, applies to remaining classifications, including most economic and social legislation, and asks only whether the classification is rationally related to a legitimate government interest.((10)) That this three-tiered structure accurately describes current Supreme Court practice is not contested as a descriptive matter; it appears uniformly across legal references spanning the ideological spectrum.

===== Limits and Open Questions =====

The descriptive consensus above does not extend to several adjacent and consequential questions, where legal scholars and jurists remain divided along lines that frequently do not track conventional left-right alignment.

  * **What should replace Slaughter-House's narrow reading.** Agreement that the 1873 decision was wrong does not translate into agreement about what the Privileges or Immunities Clause actually protects. Kurt Lash has argued the clause covers only rights enumerated elsewhere in the Constitution, while Christopher Green has argued it guarantees a broader equality among similarly situated citizens.((11)) Commentary on the case's 150th anniversary likewise noted there is no scholarly unanimity on the clause's scope, and even less on what the word "abridge" requires.((12)) The Supreme Court itself has used the clause to strike down a state law only once in the modern era, in Saenz v. Roe (1999), and has not signaled an intent to revisit Slaughter-House more broadly despite an originalist majority.
  * **Substantive due process.** Whether the Due Process Clause protects unenumerated substantive rights at all, as opposed to only procedural fairness, is a long-running and unresolved dispute. Justice Felix Frankfurter rejected any incorporation through that clause, while others have built entire lines of doctrine, including rights to contraception, abortion, and intimate association, on it.((13)) Critics on originalist and textualist grounds, and some on the political left dissatisfied with the doctrine's instability, both question whether "substantive due process" is coherent as a category.
  * **The legitimacy of tiered scrutiny itself.** Separately from how the tiers are applied, some scholars and jurists reject the tiered framework as a method. Justice Thurgood Marshall argued for a continuous spectrum rather than discrete tiers; Justice John Paul Stevens argued there should be only one standard, since the constitutional text describes only one Equal Protection Clause.((14)) Other scholarship argues the tiers have no basis in the Fourteenth Amendment's original meaning, since strict scrutiny was not formulated until 1957 and the framework was not part of founding-era or Reconstruction-era legal practice.((15))
  * **Extension to new classifications.** Whether and how equal protection and due process doctrine should extend to classifications not contemplated by the 1868 ratifying generation, including sex, sexual orientation, and gender identity, remains actively and sharply contested among jurists, with the Supreme Court in United States v. Skrmetti (2025) declining to extend heightened scrutiny to classifications based on transgender status and applying rational basis review instead - a holding scholars on competing sides of the broader debate continue to dispute the implications of. This question intersects with, but is analytically distinct from, the scope disagreements described above.

===== Dissenting Viewpoints =====

  * [[fourteenth-amendment-privileges-or-immunities-revival-viewpoint|Privileges or Immunities Revival Viewpoint]] - argues the clause should be restored to a central role in constitutional adjudication, displacing substantive due process
  * [[fourteenth-amendment-substantive-due-process-skeptical-viewpoint|Substantive Due Process Skeptical Viewpoint]] - argues the doctrine lacks textual or historical grounding regardless of outcome
  * [[fourteenth-amendment-tiered-scrutiny-critical-viewpoint|Tiered Scrutiny Critical Viewpoint]] - argues the three-tier framework is judicially invented and historically unmoored
  * [[fourteenth-amendment-total-incorporation-viewpoint|Total Incorporation Viewpoint]] - argues for Justice Black's position that all of the first eight amendments bind the states identically and completely
  * [[fourteenth-amendment-original-public-meaning-viewpoint|Original Public Meaning Viewpoint]] - argues modern equal protection doctrine extends well beyond what the Reconstruction-era ratifiers understood themselves to be enacting

===== Related Pages =====

  * [[fourteenth-amendment]] - Main Topic
  * [[fourteenth-amendment-history]] - History
  * [[fourteenth-amendment-incorporation-debate]] - Debate
  * [[fourteenth-amendment-slaughter-house-cases-controversy]] - Controversy
  * [[fifteenth-amendment-history-consensus]] - related Consensus page
  * [[brown-v-board-of-education-legal-consensus]] - related Consensus page
  * [[brown-v-board-of-education-constitutional-vindication-viewpoint]] - related Viewpoint page

===== Footnotes =====

  1. U.S. Const. amend. XIV, § 1.
  2. Library of Congress, Congressional Research Service, "Early Doctrine on Incorporation of the Bill of Rights," Constitution Annotated, accessed June 26, 2026, https://constitution.congress.gov/browse/essay/amdt14-S1-4-2/ALDE_00013745/.
  3. Library of Congress, Congressional Research Service, "Modern Doctrine on Selective Incorporation of Bill of Rights," Constitution Annotated, accessed June 26, 2026, https://constitution.congress.gov/browse/essay/amdt14-S1-4-3/ALDE_00013746/.
  4. Cornell Law School, Legal Information Institute, "Due Process Clause and Incorporation: Early Doctrine," U.S. Constitution Annotated, accessed June 26, 2026, https://www.law.cornell.edu/constitution-conan/amendment-14/section-1/due-process-clause-and-incorporation-early-doctrine.
  5. Akhil Reed Amar, quoted in "The Slaughterhouse Cases: Interpreting the Reconstruction Amendments," National Constitution Center, accessed June 26, 2026, https://constitutioncenter.org/blog/the-slaughterhouse-cases-interpreting-the-reconstruction-amendments.
  6. Clarence Thomas, dissenting opinion, Saenz v. Roe, 526 U.S. 489, 521-28 (1999) (Thomas, J., dissenting); see also "Slaughter-House Cases," Wikipedia, accessed June 26, 2026, https://en.wikipedia.org/wiki/Slaughter-House_Cases.
  7. Kermit Roosevelt III, "What If Slaughter-House Had Been Decided Differently?," Indiana Law Review, accessed June 26, 2026, https://journals.indianapolis.iu.edu/index.php/inlawrev/article/download/17983/18101/25292.
  8. Congressional Research Service, "Equal Protection: Strict Scrutiny of Racial Classifications," Congress.gov, accessed June 26, 2026, https://www.congress.gov/crs-product/IF12391.
  9. Justia, "Equal Protection Supreme Court Cases," accessed June 26, 2026, https://supreme.justia.com/cases-by-topic/equal-protection/.
  10. Justia, "Equal Protection Rights Legally Provided by the Constitution," Constitutional Law Center, accessed June 26, 2026, https://www.justia.com/constitutional-law/equal-protection-under-the-constitution/.
  11. Christopher R. Green, "Incorporation, Total Incorporation, and Nothing But Incorporation," William & Mary Bill of Rights Journal, accessed June 26, 2026, https://scholarship.law.wm.edu/cgi/viewcontent.cgi?article=1746&context=wmborj.
  12. "Reversing the Legacy of Slaughter-House," Bunk History, accessed June 26, 2026, https://www.bunkhistory.org/exhibits/scotus/388/11829; see also Kermit Roosevelt III, "What If Slaughter-House Had Been Decided Differently?," Indiana Law Review (cited above), discussing the absence of scholarly agreement on the clause's scope.
  13. Cornell Law School, Legal Information Institute, "Incorporation Doctrine," Wex, accessed June 26, 2026, https://www.law.cornell.edu/wex/incorporation_doctrine.
  14. "Equal Protection Clause," Wikipedia, accessed June 26, 2026, https://en.wikipedia.org/wiki/Equal_Protection_Clause.
  15. "Against the Tiers of Constitutional Scrutiny," National Affairs, accessed June 26, 2026, https://www.nationalaffairs.com/publications/detail/against-the-tiers-of-constitutional-scrutiny.