Appellant PPG Industries (PPG) filed this diversity action below in a Louisiana federal court against appellee Continental Oil Company (Conoco) for a declaration of the parties’ rights under a gas sale contract and for an injunction to restrain Conoco from performing certain acts which would constitute a breach of the contract or impair Conoco’s ability to perform it. On Conoco’s motion the district court stayed further proceedings pending final determination of an action for a declaratory judgment previously filed by Conoco against PPG and one other party in a Texas state court which raised the same issues as the federal suit. PPG appeals from the stay order under 28 U.S.C.A. § 1292(b), having obtained the requisite certificate from *676 the district court and permission from this court to take this interlocutory appeal. 1 We affirm the ruling of the district court.
Under a 1963 contract, last amended in 1969, Conoco agreed to sell to PPG on a continuing basis until 1987 large quantities of natural gas which PPG needed for operation of its large chemical plant at Lake Charles, Louisiana. PPG planned to rely heavily on this gas to support expanded operations at the Lake Charles plant, and it so informed Conoco when the contract was amended in 1969. By 1972, however, Conoco had realized that the contract had become “impossible or commercially impracticable of performance because of the drastic national shortage of natural gas and government regulation,” 2 and it notified PPG that in 1973 or 1974 it would be unable to supply the amounts of gas agreed upon. PPG and Conoco representatives arranged to meet on May 22, 1972 to discuss the contract and to seek solutions to the problem caused by the gas shortage. On May 10, 1972, about two weeks before the meeting, Conoco filed suit in a state district court in Harris County, Texas against PPG and Olin Corporation, another of its major gas customers, for a declaratory judgment that its failure to supply the amounts of gas originally contemplated would not be a breach of its contractual duties. Subsequently, Olin Corporation was granted a severance, and Conoco amended its original petition to add other gas customers as declaratory defendants.
Since the filing of the original Texas suit by Conoco, PPG has undertaken several manuevers designated to relocate the litigation on the contractual questions in Louisiana, where it believes the applicable choice-of-law rule 3 and the substantive contracts law 4 are more favorable, and Conoco has battled — successfully so far — to confine the litigation to the Texas forum. PPG has sought three times to remove the Texas suit to a federal court in Texas, which might then transfer the case to a federal court in Louisiana; finding a slightly different set of defendants on each removal attempt due to severances of some defendants and additions of others, the federal district court in Texas each time remanded to the state court, either because the requisite diversity did not exist between Con-oco and each of the defendants or because one of the declaratory defendants was a Texas resident. See 28 U.S.C.A. § 1441. PPG also filed suit on May 31, 1972 against Conoco in a Louisiana court in Calcasieu Parish, but that court dismissed the action in deference to the Texas court, which had issued a temporary restraining order prohibiting PPG from proceeding further in the Calcasieu Parish suit.
*677 The instant action for declaratory and injunctive relief, 5 filed by PPG on June 29, 1972 in the federal district court in Lakes Charles, Louisiana represents PPG’s latest tactic to gain access to a Louisiana forum, and the district court’s order staying further proceedings pending the outcome of the Texas suit is the barrier which presently blocks this route. Whether the stay order was properly entered depends on the answers to two questions: (1) Whether the district court had discretionary power to stay further proceedings in a diversity suit for declaratory and injunctive relief in deference to a pending state declaratory judgment action, and (2) if so, whether the district court properly exercised its discretion in this case. Upon consideration, we believe both questions must be answered in the affirmative.
I. Discretionary Power to Stay
Where federal action and a parallel state action involving the same controversy are both proceedings in rem or quasi in rem, so that the granting of effective relief requires possession or control of the res, the court which first assumes jurisdiction acquires exclusive jurisdiction and deprives the other court of power to decide the case. Princess Lida of Thurn and Taxis v. Thompson, 1939,
Each court is free to proceed in its own way and in its own time, without reference to the proceedings in the other court. Whenever a judgment is rendered in one of the courts and pleaded in the other, the effect of that judgment is to be determined by the application of the principles of res ad-judicata by the court in which the action is still pending in the orderly exercise of its jurisdiction, as it would determine any other question of fact or law arising in the progress of the case.
Kline v. Burke Construction Company, 1922,
PPG, to support its argument that the stay order was improper, relies principally on Meredith v. City of Winter Haven, 1943,
The diversity jurisdiction was not conferred for the benefit of the federal courts or to serve their convenience. Its purpose was generally to afford to suitors an opportunity in such cases, at their option, to assert their right in the federal rather than in the state courts. In the absence of some recognized public policy or defined principle guiding the exercise of the jurisdiction conferred, which would in exceptional cases warrant its non-exercise, it has from the first been deemed to be the duty of the federal courts, if their jurisdiction is properly invoked, to decide questions of state law whenever necessary to the rendition of a judgment. . . . When such exceptional circumstances are not present, denial of that opportunity by the federal courts merely because the answers to the questions of state law are difficult or uncertain or have not yet been given by the highest court of the state, would thwart the purpose of the jurisdictional act.
The exceptions relate to the discretionary powers of courts of equity. An appeal to the equity jurisdiction conferred on federal district courts is an appeal to the sound discretion which guides the determinations of courts of equity.
PPG’s position in this suit is that pendency of a parallel state action is not a special circumstance under Meredith, and that the district court in this case should therefore proceed to adjudicate the controversy before it. We do not believe, however, that Meredith can fairly be read as forbidding a federal court to stay an equity suit pending the outcome of a parallel state action. In Meredith there was no pending parallel state action, and the Court did not directly consider the question of whether such a state action might warrant a federal stay. 6 *679 Nor did the “special circumstances” list purport to be exhaustive.
Apparently to avoid the force of
Meredith,
Conoco attempts to characterize this case as a declaratory judgment action, in which the injunctive relief sought is only “ancillary” or is “premature,” and thus to bring it under the rule of Brillhart v. Excess Insurance Company, 1942,
While we are thus unable to agree with Conoco that Brillhart controls this case, we do believe that Brill-hart and cases 7 decided after it and after Meredith have made manifest a policy against dual litigation which applies with equal force to declaratory actions and to ordinary equity suits, and which, though not included in the Mededith list of exceptional circumstances, has given rise to a discretionary power in the federal courts to stay proceedings in equity suits in deference to a parallel state action. Two of the bases underlying the policy to which we refer are seen in the Brill-hart opinion:
Ordinarily it would be uneconomical as well as vexatious for a federal court to proceed in a declaratory judgment suit where another suit is pending in a state court presenting the same is *680 sues, not governed by federal law, between the same parties. Gratuitous interference with the orderly and comprehensive disposition of a state court litigation should be avoided.
In the context of federal actions attacking state criminal proceedings or the collection of federal taxes the Supreme Court has explicitly held that the factors governing the decision to grant or withhold an injunction or declaratory relief are largely the same,
see
Samuels v. Mackell, 1971,
Since
Meredith
was decided in 1943, the cases have relied increasingly on the same criteria in considering the appropriateness of the two remedies when they are both sought in the same case. In Lear Siegler v. Adkins, 9th Cir. 1964,
In Occidental Life Insurance Company v. Nichols, 5th Cir. 1954,
Language in Supreme Court cases since
Meredith
indicates that that tribunal has also decided the propriety of granting or withholding injunctive relief under criteria similar to those applicable when only a declaratory judgment is sought. In Eccles v. Peoples Bank of Lakewood Village, 1947,
This Court has disci'etion to refuse to consider a petition for a declaratory judgment and an injunction to stop a threatened or existing injury. That discretion is not unfettered. . . There is no difference between declaratory suits involving an equitable remedy and other equity suits. Where an actual controversy with federal jurisdiction exists over the legal relations of adverse parties, discretion usually cannot properly be exercised by refusing an adjudication. Meredith v. City of Winter Haven,320 U.S. 228 ,64 S.Ct. 7 ,88 L.Ed. 9 ; cf. Bell v. Hood,327 U.S. 678 ,66 S.Ct. 773 ,90 L.Ed. 939 . Unusual circumstances, not here present, such as other pending suits, Brillhart v. Excess Insurance Co. of America,316 U.S. 491 ,62 S.Ct. 1173 ,86 L.Ed. 1620 , or super-session of state authority, Great Lakes Dredge & Dock Co. v. Huffman,319 U.S. 293 ,63 S.Ct. 1070 ,87 L.Ed. 1407 , sometimes justify refusal of relief.
The injunctive and declaratory remedies are discretionary. .
Further, the declaratory judgment and injunctive remedies are equitable in nature, and other equitable defenses may be interposed. If a multiplicity of suits are undertaken in order to harass the Government or to delay enforcement, relief can be denied on this ground alone. Truly v. Wanzer,5 How. 141 , 142,12 L.Ed. 88 ; cf. Brillhart v. Excess Ins. Co., . . .
Upon consideration of the authorities, we conclude that in an equity suit, the federal district court has discretionary power to stay its hand pending the outcome of a parallel state action. We are aware that stays have
*682
been upheld in some cases which were legal rather than equitable or declaratory in nature.
See, e. g.,
Aetna State Bank v. Altheimer, 7th Cir. 1970,
We recognize that a stay pending final determination of a state suit between the same parties and the same issues will probably have the same practical effect as a dismissal would have, since the state judgment when final may be pleaded as res judicata in the federal action. Amdur v. Lizars,
supra;
Mottolese v. Kaufman,
supra; cf.
McClennan v. Carland, 1910,
Conceivably state action could be quite unreasonably delayed or other factual situations not now anticipated might develop in the state litigation which would cause the district court on appropriate petition to desire to reactivate and to go forward with the pending but presently stayed action.
Aetna State Bank v. Altheimer,
supra
II. Proper Exercise of Discretion to Stay
Conoco argues that the district court’s decision to stay should not be disturbed on appeal except for an abuse of discretion. We agree with this proposition generally, but because of the probable dismissal-like effect of a stay to permit a state court to decide the case first, we think the appellate court must subject the district court’s exercise of discretion to a relatively strict standard of review. Many discretionary decisions may be reversed on appeal only if the appellate court finds they were arbitrarily made or that no reasonable man would have decided the question as the trial judge did.
See
Delno v. Market Street Railway Company, 9th Cir. 1942,
In exercising its discretion to grant or deny a stay in an equity suit pending a determination of a parallel state suit — one involving the same parties and the same issues as the federal suit — the district court should consider several factors. Fundamentally, the district court should determine whether the state action provides an adequate vehicle for adjudicating the claims of the parties and whether the federal action serves some purpose beyond mere duplication of effort.
*683 [A] district court . . . should ascertain whether the questions in controversy between the parties to the federal suit, and which are not foreclosed under the applicable substantive law can better be settled in the proceeding pending in the state court. This may entail inquiry into the scope of the pending state court proceeding and the nature of defenses open there. The federal court may have to consider whether the claims of all parties and interests can satisfactorily be adjudicated in that proceeding, whether necessary parties have been joined, whether such parties are amenable to process in that proceeding, etc.
Brillhart v. Excess Insurance Company, 1942,
The federal district court in this case determined that the Texas state suit and the Louisiana federal suit “presented for judicial determination the same controversy,” and that the “Texas court is perfectly capable of deciding whether Louisiana or Texas law should control in the adjudication of the matter, and of correctly applying whichever law is applicable.” The court named as its sole ground for granting the stay “the generally recognized rule that the court first acquiring jurisdiction should be permitted to proceed without interference from a court of another jurisdiction.” These determinations made by the district court, and borne out by the record, tend to support the discretionary decision to stay pending the outcome of the Texas suit. In addition, the record reflects that at least three of Conoco’s other gas customers with contract and supply difficulties similar to those of PPG have been joined as declaratory defendants in Texas, but could not be joined in a federal suit in Louisiana without destroying diversity; the presence of these additional parties in the Texas suit, while not strictly necessary to a declaration of rights under the PPG-Conoco contract, will permit a more advantageous perspective on what may be viewed as a single, multi-party controversy. Nothing has come to the attention of this court which would indicate a stay would be unfair to PPG. We understand PPG’s desire to litigate the controversy in a Louisiana forum under a choiee-of-laws rule, which it believes is more favorable to its position, and Conoco’s desire to litigate in Texas, and we do not fault PPG or Conoco for the procedural fencing and maneuvering in which each has engaged for the purpose of advancing its interests. But we cannot say that either the Texas or the Louisiana choice-of-law rule is more or less fair than the other, and we perceive no unfairness in requiring PPG to pursue settlement of this controversy in only a single forum, which we are confident is equal to the task presented to it. PPG has not suggested that adjudication by the Texas court will be unduly delayed or that it cannot secure the same coercive relief in the Texas suit, if it should ultimately prevail, which it has sought in the federal suit, either by way of *684 counterclaim or by a subsequent suit or application to the Texas court based on the declaratory judgment which will be rendered.
Accordingly, we believe the exercise of discretion by the district court in this instance was proper, and its judgment is
Affirmed.
Notes
. Since we conclude 28 U.S.C.A. § 1292 (b) supplies appellate jurisdiction here, we need not consider whether § 1292(a). (1) provides an independent jurisdictional basis. Lear Siegler, Inc. v. Adkins, 9th Cir. 1964,
. The quoted language is from Conoco’s petition for a declaratory judgment filed in the 157th District Court of Harris County, Texas, filed May 10, 1972 and numbered 907308 in that court.
. While the parties apparently agree that a state or federal court in Louisiana, using the Louisiana choice-of-law rule, would apply Louisiana substantive contract law, it is uncertain whether the Texas court will apply Texas or Louisiana contract law.
. The Uniform Commercial Code forms a part of the Texas law of contracts, but Louisiana has not adopted the UCC. Apparently, the UCC provision which PPG hopes to escape by litigating in a Louisiana forum is § 2-615, which provides in part:
Delay in delivery or non-delivery in whole or in part by seller is not a breach of his duty under a contract for sale if performance as agreed has been made impracticable by the occurrence of a contingency, the non-occurrence of which was a basic assumption on which the contract was made. .
. In addition to a declaration that Conoco is strictly bound to supply the amounts of gas specified in the contract, PPG sought a permanent injunction restraining Conoco from “(1) Entering into any new gas sale contract that would adversely affect Conoco’s ability to perform its contract with PPG; (2) Failing to purchase gas or substituting fuel to satisfy its contractual obligations with PPG, if such purchase is required for Conoco to perform its contract commitment with PPG; (3), Threatening to breach its contract with PPG;” and ordering Conoco “(4) ... to perform its obligations under the contract to deliver natural gas in the quantities, at the times, and for the prices set forth in said contract as demanded by PPG.”
. The lack of a i>arallel state suit xiend-ing at the time the federal action was abated is a factor which also distinguishes County of Allegheny v. Frank Mashu-
*679
da Company, 1959,
.
See, e. g.,
Provident Tradesmens Bank & Trust Company v. Patterson, 1968,
. While the discretionary nature of traditional equitable remedies derives from history, the source of the discretionary power to abate a declaratory action is the Declaratory Judgment Act itself, which “was an authorization, not a command.” Public Affairs Associates, Inc. v. Rickover, 1962,
