Opinion of the Court
Court granted summary judgment in favor of respondents and permanently enjoined enforcement of the Act, reasoning that “viability marks the earliest point at which the State’s interest in fetal life is constitutionally adequate to justify a legislative ban on nontherapeutic abortions” and that 15 weeks’ gestational age is “prior to viability.” Jackson Women’s Health Org. v. Currier, 349 F. Supp. 3d 536, 539–540 (SD Miss. 2019) (internal quotation marks omitted). The Fifth Circuit affirmed. 945 F. 3d 265 (2019).
We granted certiorari, 593 U. S. ___ (2021), to resolve the question whether “all pre-viability prohibitions on elective abortions are unconstitutional,” Pet. for Cert. i. Petitioners’ primary defense of the Mississippi Gestational Age Act is that Roe and Casey were wrongly decided and that “the Act is constitutional because it satisfies rational-basis review.” Brief for Petitioners 49. Respondents answer that allowing Mississippi to ban pre-viability abortions “would be no different than overruling Casey and Roe entirely.” Brief for Respondents 43. They tell us that “no half-measures” are available: We must either reaffirm or overrule Roe and Casey. Brief for Respondents 50.
II
We begin by considering the critical question whether the Constitution, properly understood, confers a right to obtain an abortion. Skipping over that question, the controlling opinion in Casey reaffirmed Roe’s “central holding” based solely on the doctrine of stare decisis, but as we will explain, proper application of stare decisis required an assessment of the strength of the grounds on which Roe was based. See infra, at 45–56.
We therefore turn to the question that the Casey plurality did not consider, and we address that question in three steps. First, we explain the standard that our cases have used in determining whether the Fourteenth Amendment’s reference to “liberty” protects a particular right. Second,
