The Incorporation Doctrine stands as a pillar of American constitutional law, ensuring that the rights enshrined in the Bill of Rights protect individuals from state and local government overreach—not just federal action. Through a series of Supreme Court rulings, key liberties such as free speech, assembly, and privacy have been “incorporated” to apply to the states via the Fourteenth Amendment. This doctrine has proven especially vital for advancing LGBTQ+ rights, providing the legal foundation for landmark victories in marriage equality, sodomy decriminalization, and employment protections.

The Foundations of the Incorporation Doctrine

From Barron v. Baltimore to Selective Incorporation

The story of incorporation begins with Barron v. Baltimore (1833), where Chief Justice John Marshall held that the Bill of Rights applied only to the federal government, not the states. For decades, states could ignore federal protections. The ratification of the Fourteenth Amendment in 1868 changed that calculus. Its Due Process Clause prohibits states from depriving “any person of life, liberty, or property, without due process of law.” The Supreme Court gradually interpreted this clause to “incorporate” specific Bill of Rights guarantees, making them binding on state governments. This process is known as selective incorporation—applying rights one by one as cases arise. For example, freedom of speech was incorporated in Gitlow v. New York (1925), and the right to counsel in Gideon v. Wainwright (1963).

The Role of the Fourteenth Amendment

The Fourteenth Amendment is the engine of incorporation, containing two clauses critical to LGBTQ+ rights: the Due Process Clause and the Equal Protection Clause. The Due Process Clause protects fundamental rights and liberty interests, while the Equal Protection Clause guards against arbitrary discrimination. Together, they have allowed courts to strike down laws that criminalize private consensual conduct, deny marriage to same-sex couples, or penalize individuals for their sexual orientation. The incorporation of these protections through the Fourteenth Amendment means no state can ignore them.

Selective Incorporation vs. Total Incorporation

In the mid-20th century, Justice Hugo Black advocated for “total incorporation”—applying the entire Bill of Rights to the states at once. That approach was rejected. Instead, the Court adopted a case-by-case method based on “fundamental fairness.” In Palko v. Connecticut (1937), Justice Cardozo wrote that only those rights “implicit in the concept of ordered liberty” should be incorporated. Later, in Duncan v. Louisiana (1968), the Court set a test: is the right essential to a scheme of ordered liberty? This selective approach allowed the Court to carefully expand protections for civil rights movements, including LGBTQ+ equality, when society’s understanding of liberty evolved.

How Incorporation Doctrine Has Shaped LGBTQ+ Rights

Privacy Rights: Lawrence v. Texas (2003)

The modern legal path for LGBTQ+ rights began with privacy. In Lawrence v. Texas, the Supreme Court struck down a Texas law that criminalized same-sex intimate conduct. The Court held that the Due Process Clause, incorporated to the states, protects adult consensual sexual privacy as a liberty interest. Writing for the majority, Justice Kennedy declared: “Liberty presumes an autonomy of self that includes freedom of thought, belief, expression, and certain intimate conduct.” This decision overturned Bowers v. Hardwick (1986) and ended the criminalization of gay sex in states that still had such bans. Lawrence relied directly on the incorporation doctrine: the right to privacy, first recognized in Griswold v. Connecticut (1965) for contraception, was now applied to same-sex couples. Without incorporation, states could have continued to prosecute private intimacy.

Marriage Equality: Obergefell v. Hodges (2015)

The capstone case of same-sex marriage rights, Obergefell v. Hodges, rested squarely on the Due Process and Equal Protection Clauses as incorporated through the Fourteenth Amendment. The Court ruled that the fundamental right to marry applies to same-sex couples. Justice Kennedy again wrote: “The right to marry is a fundamental right inherent in the liberty of the person, and under the Due Process and Equal Protection Clauses of the Fourteenth Amendment couples of the same-sex may not be deprived of that right and that liberty.” Because the Due Process Clause had long been incorporated to apply to the states (for example, the right to marry an interracial partner in Loving v. Virginia), the Court logically extended that logic. Obergefell forced all fifty states to recognize same-sex marriages, ending a patchwork of state laws. A closer look at the decision shows that the incorporation of marital privacy and autonomy was essential to the ruling. The majority noted that “the history of marriage is one of both continuity and change,” and that the Constitution’s guarantees, as incorporated, must keep pace.

Employment Protection: Bostock v. Clayton County (2020)

In Bostock v. Clayton County, the Court addressed whether Title VII of the Civil Rights Act of 1964 prohibits discrimination based on sexual orientation or transgender status. While Title VII is a federal statute, the case’s reasoning intertwines with constitutional protections. The Court interpreted “sex” discrimination to include discrimination against LGBTQ+ individuals. Justice Gorsuch wrote: “An employer who fires an individual for being homosexual or transgender fires that person for traits or actions it would not have questioned in members of a different sex. Sex plays a necessary and undisguisable role in the decision, exactly what Title VII forbids.” Although Bostock is a statutory decision, it reinforces the Equal Protection principle that discrimination based on sex is suspect. Many lower courts now view Bostock as persuasive authority for constitutional claims under the incorporated Equal Protection Clause. The decision has already been cited in cases challenging state laws that discriminate against transgender individuals in bathrooms, sports, and healthcare.

Anti-Discrimination and Equal Protection: Romer v. Evans (1996)

Earlier, Romer v. Evans (1996) demonstrated how the Equal Protection Clause, as incorporated, can strike down laws that single out LGBTQ+ people for disfavored treatment. Colorado had passed Amendment 2, which forbade any state or local government from protecting people based on sexual orientation. The Supreme Court held that the amendment lacked a rational basis and violated the Equal Protection Clause. Justice Kennedy wrote that the law was “a classification of persons undertaken for its own sake, something the Equal Protection Clause does not permit.” Romer applied the incorporated Equal Protection Clause to invalidate a state law that explicitly targeted gay and lesbian people. It was a critical precedent that paved the way for later victories.

The Continuing Impact for Transgender and Nonbinary Individuals

Equal Protection Challenges in Bathroom Bans and Healthcare

As society grapples with transgender rights, the incorporation doctrine remains a crucial tool. Cases challenging state laws that restrict bathroom access or ban gender-affirming care for minors invoke both the Due Process and Equal Protection Clauses. For example, in Grimm v. Gloucester County School Board (4th Cir. 2020), a transgender boy sued under Title IX and the Equal Protection Clause after his school denied him access to the boys’ restroom. The Fourth Circuit ruled that discrimination against a person for being transgender is sex discrimination, citing Bostock and the Equal Protection Clause. The court also emphasized that the Fourteenth Amendment, as incorporated, applies to school districts. Similar cases—Adams v. School Board of St. Johns County (11th Cir. 2021) and Brandt v. Rutledge (8th Cir. 2022, regarding Arkansas’s ban on gender-affirming care)—argue that states cannot deny equal protection to transgender people. The outcome of these battles often hinges on whether courts apply heightened scrutiny under the incorporated Equal Protection Clause.

Potential Role of Incorporation Doctrine in Future Cases

Looking ahead, the incorporation doctrine may be invoked in disputes over religious exemptions and anti-discrimination laws. For instance, if a state passes a law allowing businesses to refuse service to LGBTQ+ customers based on religious belief, affected individuals could argue that such a law violates the incorporated Equal Protection Clause because it singles out a protected class. Alternatively, religious claimants may assert that their free exercise rights—incorporated through the First Amendment—allow them to discriminate. The Supreme Court’s 2023 decision in 303 Creative LLC v. Elenis allowed a web designer to refuse to create wedding websites for same-sex couples, citing free speech rights. That decision was based on the First Amendment, which is incorporated. Thus, incorporation is a double-edged sword, protecting the rights of both LGBTQ+ individuals and those who oppose same-sex marriage on religious grounds. Future courts will need to balance these competing incorporated rights.

Criticisms and Limitations

Originalism vs. Living Constitution

The incorporation doctrine itself is not without controversy. Originalist justices argue that the Fourteenth Amendment was never intended to incorporate the entire Bill of Rights, let alone expand its meaning to cover sexual orientation. Justice Clarence Thomas, for example, has argued that Obergefell and Lawrence were wrongly decided because the Due Process Clause does not protect unenumerated fundamental liberties at the state level. Critics of selective incorporation contend that it gives judges too much power to create rights not rooted in the text. Proponents counter that the Constitution’s broad language—especially “liberty” and “equal protection”—must be interpreted in light of evolving standards of decency. The tension between originalism and a living constitution continues to shape the trajectory of LGBTQ+ rights.

Religious Freedom Arguments

Another limitation arises when religious freedom clashes with LGBTQ+ rights. The First Amendment’s Free Exercise Clause, also incorporated to the states, protects the right to practice one’s religion. In cases involving wedding vendors, adoption agencies, or public accommodations, courts must weigh the incorporated right to free exercise against the incorporated right to equal protection. The Supreme Court’s decision in Fulton v. City of Philadelphia (2021) avoided a broad ruling, but future cases could narrow or expand protections for either side. These conflicts highlight that incorporation does not guarantee a hierarchy of rights; it simply ensures that both sets of rights apply uniformly across the country. The ultimate balance is left to the courts.

Conclusion

The Incorporation Doctrine has been an indispensable legal mechanism for advancing LGBTQ+ rights, from decriminalizing same-sex intimacy to securing marriage equality and employment protections. By applying the Bill of Rights and the Fourteenth Amendment to state and local governments, the doctrine ensures that fundamental liberties are not subject to the whims of state legislatures. The cases of Lawrence, Obergefell, Bostock, and Romer show how incorporation gives teeth to constitutional promises. As society continues to debate the rights of transgender and nonbinary individuals, and as religious liberty claims evolve, the incorporation doctrine will remain at the center of the conversation. It is a living tool—one that allows a centuries-old Constitution to meet the demands of a more inclusive America. Understanding this doctrine is essential for anyone who wishes to grasp the legal underpinnings of the LGBTQ+ rights movement and the ongoing struggle for equality in every state and territory.