Cite as: 506 U. S. 139 (1993)
Blackmun, J., concurring
Respondent argues in the alternative that a distinction should be drawn between cases in which the determination of a State or state agency's claim to Eleventh Amendment immunity is bound up with factual complexities whose resolution requires trial and cases in which it is not. See Tr. of Oral Arg. 30-32; cf. Dube v. State University of New York, 900 F. 2d 587, 594 (CA2 1990) (immediate appeal will lie where immunity can be found as a matter of law), cert. denied, 501 U. S. 1211 (1991). On this view, for example, an order denying a motion to dismiss a suit against a named State would be immediately appealable, whereas the same order, when issued in a suit which presents difficult factual questions as to whether an agency is an "arm of the State," would not. We see little basis for drawing such a line. See Mitchell v. Forsyth, 472 U. S., at 527-529, and n. 10. In any event, it does not appear to us that the determination of PRASA's status under the Eleventh Amendment implicates any extraordinary factual difficulty and the issue of its entitlement to immunity can be fully explored in the Court of Appeals on remand.
III
We hold that States and state entities that claim to be "arms of the State" may take advantage of the collateral order doctrine to appeal a district court order denying a claim of Eleventh Amendment immunity. The judgment of the Court of Appeals is reversed, and the case is remanded for further proceedings consistent with this opinion.
It is so ordered.
Justice Blackmun, concurring.
I join the Court's opinion but write separately to make plain once again my position on one feature. I continue to
fails. See Libby v. Marshall, 833 F. 2d 402, 406 (1987). The Eleventh Amendment is concerned not only with the States' ability to withstand suit, but with their privilege not to be sued.
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