Whether Congress may use its Article I powers, including the Commerce Clause power underlying the FLSA, to subject a nonconsenting State to a private suit for damages in that State's own courts.
Holding
No. Article I does not give Congress power to subject nonconsenting States to private damages suits in their own courts.
Reasoning
The Court began from the premise that state sovereign immunity is not merely a rule derived from the Eleventh Amendment's text. It is a constitutional principle rooted in the structure, history, and federal design of the Constitution. The Eleventh Amendment confirmed the broader understanding that States entered the Union with their preexisting sovereign immunity intact, except where they surrendered it in the constitutional plan or through a constitutional amendment.
The founding-era record, in the majority's view, showed that immunity from private suit was a central attribute of sovereignty. The reaction to Chisholm v. Georgia, which permitted a private citizen to sue a State in federal court, and the swift adoption of the Eleventh Amendment demonstrated that the Nation understood Chisholm to depart from the original constitutional arrangement rather than to state it correctly.
The Supremacy Clause does not itself answer the question. Federal statutes are supreme only when enacted consistently with the Constitution's structure. Congress may impose substantive federal obligations on States, but it does not follow that Congress may enforce those obligations through private damages actions against a nonconsenting State. The Court treated the remedy against the State as a separate constitutional question from the validity of the federal substantive rule.
Seminole Tribe had already held that Article I does not authorize Congress to abrogate state sovereign immunity in federal court. The Court reasoned that this limit cannot sensibly turn on the forum. Allowing Congress to compel private suits in state court would give Congress greater authority over a State in the State's own courts than in federal courts, an anomaly the Court rejected.
History and early congressional practice supported this conclusion, according to the majority. Although Congress frequently authorized federal causes of action in state courts, early Congresses did not purport to authorize private suits for damages against nonconsenting States in their own courts. The first statutes attempting such a result were of relatively recent origin and could not overcome the longstanding practice of avoiding it.
The Court also relied on federalism and the special sovereign status of a State in its own courts. Forcing a State's judiciary to entertain private damages actions against the State would use one branch of state government to coerce the others, expose the state treasury to judgments at private litigants' initiative, and intrude on the State's authority to allocate scarce public resources through its political process.
The Court emphasized that immunity does not free States from federal law. States remain bound by valid federal statutes and the Constitution; the United States may sue a State; States may consent to suit; Congress may authorize private suits to enforce the Fourteenth Amendment under Section 5; and plaintiffs may often seek prospective injunctive relief against state officers under Ex parte Young. But none of those routes established an Article I power to authorize this private FLSA damages action against Maine.