bama’s Notice of Dismissal under Fed. R.Civ.P. 41(a)(1).. Because the district court plainly lacked subject matter jurisdiction to entertain this case, we hold that it improvidently reached a complex question of substantive state law — -whether the Attorney General had the power to manage and control complex litigation commenced by the University. Accordingly, we vacate its order of dismissal and remand to the district court with instructions that this cause be remanded to the state court from whence it came.
I.
Appellant University commenced this action on May 19, 1997 in the Circuit Court of Mobile County, Alabama, against Appellees The American Tobacco Company, American Brands, Inc. (now known as Fortune Brands, Inc.), R.J. Reynolds Tobacco Company, RJR Nabisco, Inc., Batus Tobacco Services, Inc., BAT Industries, P.L.C., British American Tobacco Company, Ltd., Brown & Williamson Tobacco Corporation, Philip Morris Inc. (Philip Morris U.S.A.), Loews Corporation, Lorillard Corporation, The Council for Tobacco Research-U.S.A., Inc. (successor to Tobacco Institute Research Committee), The Tobacco Institute, Inc., Hill & Knowlton, Inc., United States Tobacco Company, and fictitious defendants “A” through “Z” to recover damages for and restitution of the monies expended for unreimbursed medical care arising from tobacco-related illnesses. Specifically, the University brought claims for restitution, unjust enrichment, indemnity, public nuisance, fraud and misrepresentation, conspiracy, and antitrust violations.
On June 17, 1997, Appellees removed the action to federal district court on the basis of diversity jurisdiction. See 28 U.S.C. §§ 1332, 1441 (1994). The following day, June 18, 1997, Appellee R.J. Reynolds filed its answer. Almost immediately thereafter, on June 23, 1997, before any other Appellee had answered, the Attorney General of Alabama filed a Notice of Dismissal pursuant to Fed.R.Civ.P. 41(a)(1). The Attorney General argued that he was the proper plaintiff in this action because the University is an agency and instrumentality of the state subject to the Attorney General’s authority to direct and control litigation under Ala.Code § 36-15-21 (1991 & Supp.1997). The University then filed a Motion to Remand on June 26,1997, alleging lack of subject matter jurisdiction. On July 7, 1997, Appellee R.J. Reynolds filed a “Joinder in Defendants’ Memorandum of Law” requesting dismissal by order of the court pursuant to Fed. R.Civ.P. 41(a)(2).
On August 12, 1997, after conducting a hearing on the matter, the district court issued a lengthy final order finding that since the Attorney General had authority under Alabama’law to file a Notice of Dismissal in this action, the entire action was dismissed without prejudice pursuant to Fed. R.Civ.P. 41(a)(1). Specifically, the district court found that the Notice of Dismissal filed by the Attorney General immediately dismissed the case as to all Appellees other than R.J. Reynolds Tobacco Company, which previously had filed an answer. See Fed. R.Civ.P. 41(a)(1)(i). The district court concluded, however, that the dismissal also was effective as to R.J. Reynolds on July 7, 1997, when the company filed a signed pleading concurring with the Attorney General’s Notice of Dismissal. See Fed.R.Civ.P. 41(a)(1)(h). At no point did the court reach the question of its subject matter jurisdiction. This appeal followed.1
II.
We review issues of federal subject matter jurisdiction de novo. See Stovall v. City of Cocoa, 117 F.3d 1238, 1240 (11th Cir.1997). Similarly, a voluntary dismissal under Fed.R.Civ.P. 41(a)(1) is a question of law subject to de novo review. See Matthews v. Gaither, 902 F.2d 877, 879 (11th Cir.1990) (per curiam).
1
Rule 41(a)(1) voluntary dismissal without prejudice is not ordinarily appealable. See Construction Aggregates, Ltd. v. Forest Commodities Corp., 147 F.3d 1334, 1336 (11th Cir.1998) ("[V]olun-tary dismissals, granted without prejudice, are not final decisions.”) (citing Ryan v. Occidental Petroleum Co., 577 F.2d 298, 302 (5th Cir.1978)). Because of the unique circumstances of this case, however, the district court’s order effectively "terminate[d] the litigation” and was therefore an appealable final order. Mesa v. United States, 61 F.3d 20, 21 (11th Cir.1995).