Opinion of the Court
The Founders believed that both “common law sovereign immunity” and “law-of-nations sovereign immunity” prevented States from being amenable to process in any court without their consent. See Pfander, Rethinking the Supreme Court’s Original Jurisdiction in State-Party Cases,82 Cal. L. Rev. 555, 581–588 (1994); see also Nelson, Sovereign Immunity as a Doctrine of Personal Jurisdiction, 115 Harv. L. Rev. 1559, 1574–1579 (2002). The common-law rule was that “no suit or action can be brought against the king, even in civil matters, because no court can have jurisdiction over him.” 1 W. Blackstone, Commentaries on the Laws of England 235 (1765) (Blackstone). The law-of-nations rule followed from the “perfect equality and absolute independence of sovereigns” under that body of international law. Schooner Exchange v. McFaddon, 7 Cranch 116, 137 (1812); see C. Phillipson, Wheaton’s Elements of International Law 261 (5th ed. 1916) (recognizing that sovereigns “enjoy equality before international law”); 1 J. Kent, Commentaries on American Law 20 (G. Comstock ed. 1867). According to the founding era’s foremost expert on the law of nations, “[i]t does not… belong to any foreign power to take cognisance of the administration of [another] sovereign, to set himself up for a judge of his conduct, and to oblige him to alter it.” 2 E. de Vattel, The Law of Nations §55, p. 155 (J. Chitty ed. 1883). The sovereign is “exemp[t]… from all [foreign] jurisdiction.” 4 id., §108, at 486.
The founding generation thus took as given that States could not be haled involuntarily before each other’s courts. See Woolhandler, Interstate Sovereign Immunity, 2006 S. Ct. Rev. 249, 254–259. This understanding is perhaps best illustrated by preratification examples. In 1781, a creditor named Simon Nathan tried to recover a debt that Virginia allegedly owed him by attaching some of its property in Philadelphia. James Madison and other Virginia delegates to the Confederation Congress responded by
