Whether a State retains sovereign immunity from a federal-court suit brought by an Indian tribe.
Holding
Yes. Absent consent, a State is immune from a tribal suit seeking payment from the State.
Reasoning
The Eleventh Amendment’s words do not exhaust state sovereign immunity. Under the Court’s precedents, the States entered the constitutional system with immunity from federal-court suits unless they consented to suit expressly or surrendered immunity in the plan of the constitutional convention.
That immunity applies to suits by sovereigns as well as individuals. The Court had previously held that a foreign sovereign could not sue an unconsenting State, so a tribe’s own sovereign status did not settle the question.
The States surrendered immunity to suits by sister States and by the United States, but the Court found no comparable surrender for Indian tribes. States made a mutual concession to one another in the constitutional compact; tribes were not parties to that compact and did not surrender their own immunity from state suits.