S.Ct. 2240, 144 L.Ed.2d 636 (1999) (sovereign immunity extends to an “arm of the State” but not to a “lesser entity” like a municipal corporation).
Third, the federal district court has jurisdiction over Pettigrew’s claim under Title VII, which was enacted to enforce the Fourteenth Amendment. See Fitzpatrick v. Bitzer, 427 U.S. 445, 456-57, 96 S.Ct. 2666, 49 L.Ed.2d 614 (1976).
And fourth, absent the sovereign-immunity issue the supplemental-jurisdiction statute, 28 U.S.C. § 1367, would give the district court jurisdiction to hear Pettigrew’s breach-of-contract and declaratory-judgment claims. Section 1367(a) provides that a federal court with original jurisdiction over one claim (such as a Title VII claim) may exercise “supplemental jurisdiction over all other claims that are so related to claims in the action within such original jurisdiction that they form part of the same ease or controversy under Article III of the United States Constitution.”, 28 U.S.C. § 1367(a). “A claim is part of the same case or controversy if it derives from a common nucleus of operative fact.” Price v. Wolford, 608 F.3d 698, 702-03 (10th Cir.2010) (brackets and internal quotation marks omitted). That standard is satisfied here because Pettigrew premises his claims for breach of the Agreement and declaratory judgment on the same factual allegations as his Title VII claim.
The dispute before us arises because supplemental jurisdiction under § 1367 does not override the Eleventh Amendment’s bar on suing a state in federal court. See Raygor v. Regents of the Univ. of Minn., 534 U.S. 533, 541, 122 S.Ct. 999, 152 L.Ed.2d 27 (2002) (“[Section] 1367(a) [does not] authorize district courts to exercise jurisdiction over claims against nonconsenting States.”); Pennhurst State Sch. & Hosp. v. Halderman, 465 U.S. 89, 121, 104 S.Ct. 900, 79 L.Ed.2d 67 (1984). Pettigrew does not suggest that any federal statute abrogates Oklahoma’s sovereign immunity with respect to his state-law claims. Therefore, all we must resolve is whether the state waived its immunity.
Waiver of sovereign immunity must be knowing and voluntary, and the “test for determining whether a State has waived its immunity from federal jurisdiction is a stringent one.” Coll. Sav. Bank, 527 U.S. at 675, 119 S.Ct. 2219 (internal quotation marks omitted). The Supreme Court has found waiver when, for example, a state expressly consented by statute to suit in federal court, see Port Auth. Trans-Hudson Corp. v. Feeney, 495 U.S. 299, 308-09, 110 S.Ct. 1868, 109 L.Ed.2d 264 (1990), and when it voluntarily invoked federal jurisdiction by filing suit in federal court, moving to intervene in federal-court litigation, or removing a case to federal court, see Lapides v. Bd. of Regents, 535 U.S. 613, 619-24, 122 S.Ct. 1640, 152 L.Ed.2d 806 (2002). A state can likewise enter into a contract that waives its Eleventh Amendment immunity to suits related to the contract. See, e.g., Watson v. Texas, 261 F.3d 436, 442 (5th Cir.2001) (settlement agreement waived state’s immunity to suit by claimants to recover settlement proceeds); see also Ellis v. Univ. of Kan. Med. Ctr., 163 F.3d 1186, 1195, 1195 n.11 (10th Cir.1998) (“Our conclusion [that the agreement at issue did not indicate the state’s intent to waive immunity] does not foreclose the possibility that a State may demonstrate an unequivocal intent to waive Eleventh Amendment immunity by participating in a settlement.”). When a statute or other document purportedly waives a state’s Eleventh Amendment immunity, we “will give effect to [the waiver] only where stated by the most express language or by such overwhelming implication from the text as will leave no room for any other reasonable construction.” Fee