Section 5 of the Fourteenth Amendment, unlike almost all of Article I, can authorize Congress to strip the States of immunity. The Fourteenth Amendment “fundamentally altered the balance of state and federal power” that the original Constitution and the Eleventh Amendment struck. . . . Its first section imposes prohibitions on the States, including (as relevant here) that none may “deprive any person of life, liberty, or property, without due process of law.” Section 5 then gives Congress the “power to enforce, by appropriate legislation,” those limitations on the States’ authority. That power, the Court has long held, may enable Congress to abrogate the States’ immunity and thus subject them to suit in federal court. . . .
For an abrogation statute to be “appropriate” under Section 5, it must be tailored to “remedy or prevent” conduct infringing the Fourteenth Amendment’s substantive prohibitions. . . . Congress can permit suits against States for actual violations of the rights guaranteed in Section 1. . . . But Congress cannot use its “power to enforce” the Fourteenth Amendment to alter what that Amendment bars. . . . That means a congressional abrogation is valid under Section 5 only if it sufficiently connects to conduct courts have held Section 1 to proscribe.
To decide whether a law passes muster, this Court has framed a type of means-end test. For Congress’s action to fall within its Section 5 authority, we have said, there must be a congruence and proportionality between the injury to be prevented or remedied and the means adopted to that end.