Although I join Justice GINSBURG's and Justice KAGAN's dissents in full, I also dissent for another reason. In my view, the Court of Appeals lacked jurisdiction to hear this case. Consequently, we lack jurisdiction as well. See 28 U.S.C. § 1254. My reason for reaching this conclusion is the following. The Federal Arbitration Act, at § 4, says that a "court," upon being satisfied that the parties have agreed to arbitrate a claim, "shall make an order directing the parties to proceed to arbitration in accordance with the terms of the agreement." 9 U.S.C. § 4. Section 16 of the Act then says that "an appeal may not be taken from an interlocutory order ... directing arbitration to proceed under section 4 of this title." § 16(b)(2) (emphasis added). And directing arbitration to proceed is just what the District Court did here. App. to Pet. for Cert. 23a.

I

These statutory provisions reflect a congressional effort (in respect to a specific subject matter) to help resolve a more[*1423] general problem. Too few interlocutory appeals will too often impose upon parties delay and expense that an interlocutory appeal, by quickly correcting a lower court error, might have spared them. But too many interlocutory appeals will too often unnecessarily delay proceedings while a party appeals and loses. And delays can clog the appellate system, thereby slowing down the workings, and adding to the costs, of the judicial system seen as a whole. Congress' jurisdictional statutes consequently compromise, providing, for example, for interlocutory appeals in some instances, such as cases involving injunctive orders, see, e.g., 28 U.S.C. § 1292(a)(1), or where important separable legal questions are at issue, see, e.g., Ashcroft v. Iqbal , 556 U.S. 662, 671, 129 S.Ct. 1937, 173 L.Ed.2d 868 (2009), or where a district court certifies an open legal question to a court of appeals for determination, see, e.g., 28 U.S.C. § 1292(b). But often statutes and rules require the parties to proceed to the end of a trial before obtaining appellate review. See, e.g., § 1291.

The statutory provisions before us are a local species of this jurisdictional genus. In them, Congress limited interlocutory review of orders concerning arbitration in a way that favors arbitration. Consequently, § 16(a) of the FAA will normally allow an immediate appeal where arbitration is denied, but § 16(b) will normally require parties to wait until the end of the arbitration in order to bring legal questions about that proceeding to a court of appeals.

A couple of examples illustrate the point. Take first § 4 of the FAA. Section 4 provides that a "court," upon being satisfied that the parties have agreed to arbitrate a claim, "shall make an order directing the parties to proceed to arbitration in accordance with the terms of the agreement." 9 U.S.C. § 4. Section 16(a) of the FAA provides that a party may immediately appeal a district court order refusing to compel arbitration under § 4, while § 16(b) provides that a party generally may not immediately appeal a district court order compelling arbitration under § 4. Compare § 16(a)(1)(B) ("An appeal may be taken from" an order "denying a petition under section 4 of this title") with § 16(b)(2) ("[A]n appeal may not be taken from an interlocutory order ... directing arbitration to proceed under section 4 of this title").

Section 3 of the FAA provides another good example. Where a suit contains several claims, and the district court has determined that the parties agreed to arbitrate only a subset of those claims, § 3 of the FAA provides that the district court must stay the litigation at the request of either party. See § 3 (providing that a court, when referring claims for arbitration, "shall on application of one of the parties stay" the case "until such arbitration has been had"). The stay relieves the parties of the burden and distraction of continuing to litigate any remaining claims while the arbitration is ongoing. And true to the FAA's proarbitration appellate scheme, § 16(a)permits immediate appeals of district court orders refusing to enter a stay , while § 16(b) generally prohibits immediate appeals of district court orders granting a stay . Compare § 16(a)(1)(A) ("An appeal may be taken from" an order "refusing a stay of any action under section 3 of this title") with § 16(b)(1) ("[A]n appeal may not be taken from an interlocutory order ... granting a stay of any action under section 3 of this title").

I could go on. Section 16(a) of the FAA permits immediate appeal of an interlocutory order granting an injunction against arbitration, while § 16(b) generally prohibits immediate appeal of an order refusing[*1424] to enjoin an arbitration. Compare § 16(a)(2) with § 16(b)(4). Section 16(a) of the FAA permits immediate appeal of an order denying an application to compel arbitration pursuant to § 206, while § 16(b) generally prohibits immediate appeal of an order compelling arbitration pursuant to § 206. Compare § 16(a)(1)(C) with § 16(b)(3). Et cetera.

The point, however, is that the appellate scheme of the FAA reflects Congress' policy decision that, if a district court determines that arbitration of a claim is called for, there should be no appellate interference with the arbitral process unless and until that process has run its course.

With § 16's structure, and Congress' policy in mind, we can turn to the facts of this case.

II

Respondent Frank Varela is an employee of petitioner Lamps Plus, Inc. At the outset of their employment relationship, Varela and Lamps Plus agreed to arbitrate employment-related claims. Varela later filed suit against Lamps Plus on behalf of himself and a class of Lamps Plus' employees. Lamps Plus asked the District Court to compel arbitration. And the District Court granted Lamps Plus' request. Despite having won the relief that it requested, Lamps Plus appealed the District Court's order because Lamps Plus objected to the District Court's conclusion that the parties' agreement permitted arbitration on a classwide basis. The Court of Appeals affirmed the District Court's judgment. And we granted Lamps Plus' petition for certiorari to consider whether the Court of Appeals erred in so ruling.

But on those facts, I think that the Court lacks jurisdiction over Lamps Plus' petition. When Lamps Plus responded to Varela's lawsuit by seeking a motion to compel arbitration, and the District Court granted that motion, this case fell neatly into § 16(b)'s description of unappealable district court orders under the FAA. The parties were obligated by the FAA to arbitrate their dispute without the expense and delay of further litigation. If, after arbitration, the parties were dissatisfied with the award or with the District Court's arbitration related decisions, § 16(a) of the FAA provides for an appeal at that later date. See §§ 16(a)(1)(D)-(E) (permitting appeals of orders confirming, modifying, or vacating an award); see also § 16(a)(3) (permitting appeal of "a final decision with respect to an arbitration"). But, in the interim, § 16(b) deprived the Court of Appeals of jurisdiction to hear any such complaint. See §§ 16(b)(1)-(4). I recognize that Lamps Plus is dissatisfied with the arbitration that the District Court ordered here. But the District Court's order nonetheless granted the motion compelling arbitration, leaving Lamps Plus to bring its claim to an appellate court only after the arbitration is completed. See § 16(b)(2). I believe we should enforce the statutory provisions that lead to this conclusion.

Lamps Plus offers three arguments in response. First , Lamps Plus suggests the Court of Appeals had jurisdiction over Lamps Plus' appeal because the District Court order at issue here not only granted Lamps Plus's motion to compel arbitration, but also granted Lamps Plus' motion to dismiss the case. See Brief for Petitioners 29. Lamps Plus points out that § 16(a) permits the appeal of "a final decision with respect to an arbitration." 9 U.S.C. § 16(a)(3). Lamps Plus reasons that, so long as a decision is final, it is appealable under the FAA.

I disagree because I do not believe that the District Court had the discretion to dismiss the case immediately after granting Lamps Plus' motion to compel arbitration. Section 4 of the FAA permits a[*1425] district court to compel the parties to arbitrate their claim, and § 16(b)(2) explains that "an appeal may not be taken from an interlocutory order ... directing arbitration to proceed under section 4 of this title." Thus, the District Court order compelling arbitration was interlocutory and generally unappealable. As I have just explained, to read the statute any other way would contravene § 16's proarbitration appeal scheme by turning an interlocutory order that would have been unappealable under § 16(b) of the Act into a dismissal order that is appealable under § 16(a).

And because the order granting Lamps Plus' motion to compel was interlocutory, the District Court's dismissal of the case-in the very same order, see App. to Pet. for Cert. 23a-did not give the Court of Appeals jurisdiction over Lamps Plus' appeal. An improper dismissal cannot create appellate jurisdiction to review an interlocutory order.

Our decision in Microsoft Corp. v. Baker , 582 U.S. ----, 137 S.Ct. 1702, 198 L.Ed.2d 132 (2017), holds as much. The plaintiffs in Microsoft sought to appeal a district court order denying certification of a class. Under Federal Rule of Appellate Procedure 23(f), plaintiffs can ordinarily bring such an appeal only with the court of appeals' permission. But the plaintiffs in Baker , who had been denied permission to appeal, tried to circumvent that denial by stipulating to a voluntary dismissal of their claims. The voluntary dismissal, they claimed, was an appealable "final decisio[n]" under 28 U.S.C. § 1291. And in their appeal of the dismissal, they would be free to also seek review of the order denying class certification. We disagreed. As we explained there, to permit plaintiffs to "transform a tentative interlocutory order into a final judgment ... simply by dismissing their claims with prejudice" would be to "undermine § 1291's firm finality principle, designed to guard against piecemeal appeals, and subvert the balanced solution Rule 23(f) put in place for immediate review of class-action orders." Microsoft , supra , at ----, ----, 137 S.Ct. at 1716 (citation omitted).

The same reasoning applies here. Section 16(a)(3) of the FAA, like 28 U.S.C. § 1291, creates appellate jurisdiction only over "final decisions." Despite that jurisdictional limit, Lamps Plus, like the plaintiffs in Microsoft , seeks review of an interlocutory order. Like the plaintiffs in Microsoft , Lamps Plus attempts to obtain appellate review by "transform[ing]" an interlocutory order into a final decision. 582 U.S., at ----, 137 S.Ct., at 1715. Like the plaintiffs in Microsoft , Lamps Plus has done so based on an order "purporting to end the litigation"-an order that Lamps Plus itself "persuade[d] a district court to issue." Ibid. And like the plaintiffs in Microsoft , Lamps Plus does not "complain of the 'final' order that dismissed [the] case," but instead seeks "review of only the inherently interlocutory order" compelling arbitration. Ibid. (alterations omitted). Therefore, like the Court in Microsoft , I would hold that Lamps Plus cannot, by securing an unlawful dismissal, find a way around the appellate jurisdiction scheme that Congress wrote into the FAA.

Second , Lamps Plus suggests that this Court has already decided that a district court order compelling arbitration and dismissing a plaintiff's complaint creates no jurisdictional problem. Brief for Petitioners 29-30. Lamps Plus cites Green Tree Financial Corp.-Ala. v. Randolph , 531 U.S. 79, 121 S.Ct. 513, 148 L.Ed.2d 373 (2000), in support of that argument. And according to Lamps Plus, "this Court held in Randolph " that "when a district court orders arbitration and dismisses the plaintiff's claims," the order is "final" and[*1426] therefore appealable under § 16 of the FAA. Brief for Petitioners 29-30.

But Randolph does not control the jurisdictional aspect of this case. The Randolph Court explicitly reserved the question that we face now, stating: "Had the District Court entered a stay instead of a dismissal in this case, that order would not be appealable. 9 U.S.C. § 16(b)(1). The question whether the District Court should have taken that course is not before us, and we do not address it ." Randolph , supra , at 87, n. 2, 121 S.Ct. 513 (emphasis added). Thus, although the Randolph Court stated that § 16(a)(3) of the FAA permits appeals of final orders entered under the FAA, the Court did not decide whether a district court could convert an interlocutory, unappealable order under § 16(b) into an appealable order under § 16(a) by entering a dismissal instead of a stay. For that reason, Randolph does not answer the jurisdictional question here.

Third , and finally, Lamps Plus suggests that the Court of Appeals had jurisdiction because the District Court "effectively denied Lamps Plus's motion to compel arbitration" when the District Court interpreted the arbitration agreement to permit class arbitration. Brief for Petitioners 31 (emphasis deleted). Leaning heavily on dicta from Stolt-Nielsen S.A. v. AnimalFeeds Int'l Corp. , 559 U.S. 662, 130 S.Ct. 1758, 176 L.Ed.2d 605 (2010), Lamps Plus argues that class arbitration is so "fundamental[ly]" different from individual arbitration that the fact that "the district court purported to grant Lamps Plus's motion is not controlling." Brief for Petitioners 31.

But Stolt-Nielsen cannot bear the weight Lamps Plus would place on it. We held in Stolt-Nielsen that a party may not be compelled to "submit to class arbitration unless there is a contractual basis for concluding that the party agreed to do so." 559 U.S. at 684, 130 S.Ct. 1758. We did not hold that class arbitration is not arbitration at all. And because class arbitration is arbitration, the District Court's interpretation of Lamps Plus and Varela's arbitration agreement to permit class arbitration could not create appellate jurisdiction over the District Court order compelling the parties to arbitrate their dispute. See 9 U.S.C. § 16(b)(2) (prohibiting interlocutory appeals of district court orders "directing arbitration to proceed").

Nor did we hold in Stolt-Nielsen (or anywhere else) that § 16 of the FAA permits appeals of interlocutory orders directing arbitration to proceed, so long as the order incorporates some ruling that one party dislikes. If that were the rule, then § 16's limitations on appellate jurisdiction would be near meaningless. Consequently, the courts of appeals have-rightly, I believe-long recognized that they lack jurisdiction over appeals from orders that compel arbitration, "albeit not in the 'first-choice' " manner of the party that moved to compel. Al Rushaid v. National Oilwell Varco, Inc. , 814 F.3d 300, 304 (CA5 2016). See also, e.g., Blue Cross Blue Shield of Mass., Inc. v. BCS Ins. Co. , 671 F.3d 635, 638 (CA7 2011) (concluding that the court of appeals lacked jurisdiction over an order compelling arbitration but denying a motion to direct arbitrators to "hold separate rather than consolidated proceedings"); Bushley v. Credit Suisse First Boston , 360 F.3d 1149, 1154 (CA9 2004) (similar holding with respect to a request that arbitration take place before a different forum); Augustea Impb Et Salvataggi v. Mitsubishi Corp. , 126 F.3d 95, 98 (CA2 1997) (similar holding with respect to a request that the parties arbitrate in a different location). As one of those courts explained, "[p]ursuant to the plain meaning of th[e] statute ... a party cannot appeal a district court's order unless, at the end of the day, the parties are[*1427] forced to settle their dispute other than by arbitration." Id. , at 99. And Lamps Plus' characterization of the District Court's order compelling arbitration as an "effectiv[e] den[ial]" of Lamps Plus' motion "does not make it so." Blue Cross Blue Shield,supra , at 637.

Consequently, I would hold that we lack jurisdiction over this case. But because the Court accepts jurisdiction and decides the substantive legal question before us, I shall do the same. And in respect to that question I agree with Justice GINSBURG and Justice KAGAN, and I join their dissents.

I join Justice GINSBURG's dissent in full and Part II of Justice KAGAN's dissent.^[1] This Court went wrong years ago in concluding that a "shift from bilateral arbitration to class-action arbitration" imposes such "fundamental changes," Stolt-Nielsen S.A. v. AnimalFeeds Int'l Corp. , 559 U.S. 662, 686, 130 S.Ct. 1758, 176 L.Ed.2d 605 (2010), that class-action arbitration "is not arbitration as envisioned by the" Federal Arbitration Act (FAA), AT&T Mobility LLC v. Concepcion , 563 U.S. 333, 351, 131 S.Ct. 1740, 179 L.Ed.2d 742 (2011). See, e.g., id. , at 362-365, 131 S.Ct. 1740 (BREYER, J., dissenting). A class action is simply "a procedural device" that allows multiple plaintiffs to aggregate their claims, 1 W. Rubenstein, Newberg on Class Actions § 1:1 (5th ed. 2011), "[f]or convenience ... and to prevent a failure of justice," Supreme Tribe of Ben-Hur v. Cauble , 255 U.S. 356, 363, 41 S.Ct. 338, 65 L.Ed. 673 (1921). Where, as here, an employment agreement provides for arbitration as a forum for all disputes relating to a person's employment and the rules of that forum allow for class actions, an employee who signs an arbitration agreement should not be expected to realize that she is giving up access to that procedural device.

In any event, as Justice KAGAN explains, the employment contract that Frank Varela signed went further. It states that " 'any and all disputes, claims or controversies arising out of or relating to[ ] the employment relationship between the parties[ ] shall be resolved by final and binding arbitration.' " Post , at ---- (quoting App. to Pet. for Cert. 24a). It adds that Varela and Lamps Plus "consent to the resolution by arbitration of all claims that may hereafter arise in connection with [Varela's] employment." Id ., at 24a-25a. And it provides for arbitration " 'in accordance with' " the rules of the arbitral forum, which in turn allow for class arbitration. Post , at ---- (opinion of KAGAN, J.) (citing App. to Pet. for Cert. 25a-26a). That is enough to persuade me that the contract was at least ambiguous as to whether Varela in fact agreed that no class-action procedures would be available in arbitration if he and his co-workers all suffered the same harm "relating to" and "in connection with" their "employment." See id ., at 24a-25a. And the court below was correct to turn to state law to resolve the ambiguity.

The Court today reads the FAA to pre-empt the neutral principle of state contract law on which the court below relied. I cannot agree. I also note that the majority reaches its holding without actually agreeing that the contract is ambiguous. See ante, at ---- ("[W]e defer to the Ninth Circuit's interpretation and application of state law"). The concurrence, meanwhile,[*1428] offers reasons to conclude that the contract unambiguously precludes class arbitration, see ante , at ---- - ----, and n. (opinion of THOMAS, J.), which would avoid the need to displace state law at all.^[2] This Court normally acts with great solicitude when it comes to the possible pre-emption of state law, see, e.g., Medtronic, Inc. v. Lohr , 518 U.S. 470, 485, 116 S.Ct. 2240, 135 L.Ed.2d 700 (1996), but the majority today invades California contract law without pausing to address whether its incursion is necessary. Such haste is as ill advised as the new federal common law of arbitration contracts it has begotten.

Justice KAGAN, with whom Justice GINSBURG and Justice BREYER join, and with whom Justice SOTOMAYOR joins as to Part II, dissenting.

The Federal Arbitration Act (FAA or Act) requires courts to enforce arbitration agreements according to their terms. See ante, at ----. But the Act does not federalize basic contract law. Under the FAA, state law governs the interpretation of arbitration agreements, so long as that law treats other types of contracts in the same way. See DIRECTV, Inc. v. Imburgia , 577 U.S. ----, ----, 136 S.Ct. 463, 468-469, 193 L.Ed.2d 365 (2015). That well-established principle ought to resolve this case against Lamps Plus's request for individual arbitration. In my view, the arbitration agreement Lamps Plus wrote is best understood to authorize arbitration on a classwide basis. But even if the Court is right to view the agreement as ambiguous, a plain-vanilla rule of contract interpretation, applied in California as in every other State, requires reading it against the drafter-and so likewise permits a class proceeding here. See Sandquist v. Lebo Auto., Inc. , 1 Cal. 5th 233, 247, 205 Cal.Rptr.3d 359, 376 P.3d 506, 514 (2016). The majority can reach the opposite conclusion only by insisting that the FAA trumps that neutral state rule whenever its application would result in class arbitration. That holding has no basis in the Act-or in any of our decisions relating to it (including the heavily relied-on Stolt-Nielsen S.A. v. AnimalFeeds Int'l Corp. , 559 U.S. 662, 686, 130 S.Ct. 1758, 176 L.Ed.2d 605 (2010) ). Today's opinion is rooted instead in the majority's belief that class arbitration "undermine[s] the central benefits of arbitration itself."Ante, at ----. But that policy view-of a piece with the majority's ideas about class litigation-cannot justify displacing generally applicable state law about how to interpret ambiguous contracts. I respectfully dissent.

I

From its very beginning, the arbitration agreement between Lamps Plus and Frank Varela announces its comprehensive scope. The first sentence states: "[T]he parties agree that any and all disputes, claims or controversies arising out of or relating to[ ] the employment relationship between the parties[ ] shall be resolved by final and binding arbitration." App. to Pet. for Cert. 24a. The phrase "any and all disputes, claims, or controversies" encompasses both their individual and their class variants-just as any other general category (e.g., any and all chairs) includes all particular types (e.g., desk and reclining). So Varela's class action (which arose out of or related to his employment) was a "dispute,[*1429] claim or controversy" that belonged in arbitration.

The next paragraph continues in the same vein, by describing what Varela gave up by signing the agreement. "[A]rbitration," the agreement says, "shall be in lieu of any and all lawsuits or other civil legal proceedings relating to my employment." Ibid. ; see ibid. (similarly waiving the right "to file a lawsuit or other civil action or proceeding"). That is the language of forum selection: Any and all actions (both individual and class) that I could once have brought in court, I am agreeing now to bring in arbitration. The provision carries no hint of consent to surrender altogether-in arbitration as well as court-the ability to bring a class proceeding.

Further on, the remedial and procedural terms of the agreement support reading it to authorize class arbitration. The arbitrator, according to the contract, may "award any remedy allowed by applicable law." Id., at 26a. That sweeping provision easily encompasses classwide relief when the "any and all disputes" that the contract's first sentence places in arbitration call for such remedies.^[1] And under the agreement, the arbitration shall be conducted "in accordance with" the rules of either of two designated arbitration providers-both of which furnish rules for arbitrators to conduct class proceedings. Id., at 25a-26a; see, e.g. , American Arbitration Assn., Supplementary Rules for Class Arbitrations (2011).

Even the section Lamps Plus cites in arguing that the agreement bars class arbitration instead points to the opposite conclusion. In describing what the agreement covers, one provision states: "The Company and I mutually consent to the resolution by arbitration of all claims or controversies ('claims'), past, present or future that I may have against the Company." App. to Pet. for Cert. 24a; see id., at 24a-25a ("Specifically, the Company and I mutually consent to the resolution by arbitration of all claims that may hereafter arise in connection with my employment"). Lamps Plus (along with the concurrence, see ante, at ---- - ---- (opinion of THOMAS, J.)) highlights "th[e] repeated use of singular personal pronouns" there, contending that it is incompatible with a form of arbitration that also involves other parties' claims. Brief for Petitioners 17. But the use of the first person singular merely reflects that the agreement is bilateral in nature-between Varela and Lamps Plus. Those pronouns do not resolve whether one of those parties ("I") can bring to arbitration class disputes, as well as individual disputes, relating to his employment. The part of the quoted section addressing that question is instead the phrase "all claims or controversies." And that phrase supplies the same answer as the agreement's other provisions. For it too is broad enough to cover both individual and class actions-the ones Varela brings alone and the ones he shares with co-workers.^[2]

[*1430] II

Suppose, though, you think that my view of the agreement goes too far. Maybe you aren't sure whether the phrase "any and all disputes, claims or controversies" must be read to include class "disputes, claims or controversies." Or maybe you wonder whether the surrounding "I" and "my" references limit that phrase's scope, rather than merely referring to one of the contract's signatories. In short, you can see reasonable arguments on both sides of the interpretive dispute-for allowing, but also for barring, class arbitration. You are then in the majority's position, "accept[ing]" the arbitration agreement as "ambiguous." Ante, at ----. What should follow?

Under California law (which applies unless preempted) the answer is clear: The agreement must be read to authorize class arbitration. That is because California-like every other State in the country-applies a default rule construing "ambiguities" in contracts "against their drafters." Sandquist , 1 Cal. 5th, at 247, 205 Cal.Rptr.3d 359, 376 P.3d at 514 ; see Cal. Civ. Code Ann. § 1654 (West 2011) ; see also Brief for Contract Law Scholars as Amici Curiae 10-12, and n. 4 (listing decisions from all 50 States applying that rule). This anti-drafter canon-which "applies with peculiar force" to form contracts like Lamps Plus's-promotes clarity in contracting by resolving ambiguities against the party who held the pen. Sandquist , 1 Cal. 5th, at 248, 205 Cal.Rptr.3d 359, 376 P.3d at 514 (quoting Graham v. Scissor-Tail, Inc. , 28 Cal. 3d 807, 819, n. 16, 171 Cal.Rptr. 604, 623 P.2d 165, 172, n. 16 (1981) ); see Ayres & Gertner, Filling Gaps in Incomplete Contracts, 99 Yale L. J. 87, 91, 105, n. 80 (1989). And the rule makes quick work of interpreting the arbitration agreement here. Lamps Plus drafted the agreement. It therefore had the opportunity to insert language expressly barring class arbitration if that was what it wanted. It did not do so. It instead (at best) left an ambiguity about the availability of class arbitration. So California law holds that Lamps Plus cannot now claim the benefit of the doubt as to the agreement's meaning. Even the majority does not dispute that point. See ante, at ----, ----.

And contrary to the rest of the majority's opinion,^[3] the FAA contemplates that such a state contract rule will control the interpretation of arbitration agreements. Under the FAA, courts must "enforce arbitration agreements according to their terms." Epic Systems Corp. v. Lewis , 584 U.S. ----, ----, 138 S.Ct. 1612, 1621, 200 L.Ed.2d 889 (2018) (internal quotation marks omitted); see 9 U.S.C. § 4 (requiring that "arbitration proceed in the manner provided for in such agreement"). But the construction of those contractual terms (save for in limited circumstances, addressed below) is "a question of state law, which this Court does not sit to review."

[*1431] Volt Information Sciences, Inc. v. Board of Trustees of Leland Stanford Junior Univ. , 489 U.S. 468, 474, 109 S.Ct. 1248, 103 L.Ed.2d 488 (1989). The Court has made that crucial point many times. Nothing in the FAA (as contrasted to today's majority opinion) "purports to alter background principles of state contract law regarding" the scope or content of agreements. Arthur Andersen LLP v. Carlisle , 556 U.S. 624, 630, 129 S.Ct. 1896, 173 L.Ed.2d 832 (2009). Or again: When ruling on an arbitration agreement's meaning, courts "should apply ordinary state-law principles." First Options of Chicago, Inc. v. Kaplan , 514 U.S. 938, 944, 115 S.Ct. 1920, 131 L.Ed.2d 985 (1995). Or yet again: The interpretation of such an agreement is "a matter of state law to which we defer." DIRECTV, Inc. , 577 U.S., at ----, 136 S.Ct., at 468. In short, the FAA does not federalize contract law.

Except when state contract law discriminates against arbitration agreements. As this Court has explained, the FAA came about because courts had shown themselves "unduly hostile to arbitration." Epic Systems , 584 U.S., at ----, 138 S.Ct., at 1621. To remedy that problem, Congress built an "equal-treatment principle" into the Act, requiring courts to "place arbitration agreements on an equal footing with other contracts." Kindred Nursing Centers L. P. v. Clark , 581 U.S. ----, ----, 137 S.Ct. 1421, 1424, 197 L.Ed.2d 806 (2017) ; AT&T Mobility LLC v. Concepcion , 563 U.S. 333, 339, 131 S.Ct. 1740, 179 L.Ed.2d 742 (2011) (internal quotation marks omitted); see 9 U.S.C. § 2 (making arbitration agreements "valid, irrevocable, and enforceable, save upon such grounds as exist at law or in equity for the revocation of any contract"). So any state rule treating arbitration agreements worse than other contracts "stand[s] as an obstacle" to achieving the Act's purposes-and is preempted. Concepcion , 563 U.S. at 343, 131 S.Ct. 1740. That means the FAA displaces any state rule discriminating on its face against arbitration. See id., at 341, 131 S.Ct. 1740. And the Act likewise preempts any more subtle law "disfavoring contracts that (oh so coincidentally) have the defining features of arbitration agreements." Kindred Nursing , 581 U.S., at ----, 137 S.Ct., at 1426. What matters, as this Court reiterated last Term, is whether the state law in question "target[s]" arbitration agreements, blatantly or covertly, for substandard treatment. Epic Systems , 584 U.S., at ----, 138 S.Ct., at 1622.^[4] When the law does so, it cannot operate; when, conversely, it treats arbitration agreements the same as all other contracts, the FAA leaves it alone.

Here, California's anti-drafter rule is as even-handed as contract rules come. It does not apply only to arbitration contracts. Nor does it apply (as the rule we rejected in Concepcion did) only a tad more broadly to "dispute-resolution contracts," pertaining to both arbitration and litigation. 563 U.S. at 341, 131 S.Ct. 1740 (holding that a ban on collective-action waivers in those contracts worked to "disfavor[ ] arbitration"). Instead, the anti-drafter[*1432] rule, as even the majority admits, applies to every conceivable type of contract-and treats each identically to all others. See Sandquist , 1 Cal. 5th, at 248, 205 Cal.Rptr.3d 359, 376 P.3d at 514 ("This general principle of contract interpretation applies equally to the construction of arbitration provisions"); ante, at ---- - ----. And contrary to what the majority is left to insist, the rule does not "target arbitration" by "interfer[ing] with [one of its] fundamental attributes"-i.e., its supposed individualized nature. Ante, at ---- (internal quotation marks omitted); see ante, at ---- - ----. The anti-drafter rule (again, quite unlike Concepcion 's ban on class-action waivers) takes no side-favors no outcome-as between class and individualized dispute resolution. All the anti-drafter rule asks about is who wrote the contract. So if, for example, Varela had drafted the agreement here, the rule would have prevented, rather than permitted, class arbitration.^[5] Small wonder, then, that this Court has itself used the anti-drafter canon to interpret an arbitration agreement. See Mastrobuono v. Shearson Lehman Hutton, Inc. , 514 U.S. 52, 62, 115 S.Ct. 1212, 131 L.Ed.2d 76 (1995) (construing an ambiguous arbitration agreement against the drafter's interest). In that case (as properly in any other), the rule's through-and-through neutrality made preemption unthinkable.^[6]

So this case should come out Varela's way even if the agreement is ambiguous. To repeat the simple logic applicable here: Under the FAA, state law controls the interpretation of arbitration agreements unless that law discriminates against arbitration; the anti-drafter default rule is subject to no such objection; the rule therefore compels this Court to hold that the agreement here authorizes class arbitration. That the majority thinks the contract, as so read, seriously disadvantages Lamps Plus, see ante, at ---- - ----, is of no moment (any more than if state law had instead construed the contract to produce adverse consequences for Varela). The FAA was enacted to protect against judicial hostility toward arbitration agreements. See supra, at ----. But the Act provides no warrant for courts to disregard neutral state law in service of ensuring that those agreements give defendants the best terms possible. Or said otherwise: Nothing in the FAA shields a contracting party, operating against the backdrop of impartial state law, from the consequences of its own drafting decisions. How, then, could the majority go so wrong?

Stolt-Nielsen offers the majority no excuse: Far from "control[ling]" this case, ante, at ----, that decision addressed a different situation-and explicitly reserved decision of the question here. In Stolt-Nielsen , the contracting parties entered into a formal stipulation that "they had not reached any agreement on the issue of class arbitration." 559 U.S. at 673, 130 S.Ct. 1758. The case thus involved not the mere absence of express language about class arbitration, but a joint avowal that the parties had never resolved the issue.

[*1433] Facing that oddity, an arbitral panel compelled class arbitration based solely on its "own conception of sound policy." Id., at 675, 130 S.Ct. 1758 ; see id., at 676, 130 S.Ct. 1758 ("[T]he panel did [nothing] other than impose its own policy preference"). This Court rejected the panel's decision for that reason, holding that a party need not "submit to class arbitration unless there is a contractual basis for concluding that the party agreed to do so." Id. , at 684, 130 S.Ct. 1758. But the Court went no further. In particular, it did not resolve cases like this one, where a neutral interpretive rule (even if not an express term) enables an adjudicator to determine a contract's meaning. To the contrary, the Court disclaimed any view on that question. Yes, the Court held, "a contractual basis" was needed for class arbitration. Ibid. (emphasis added). But given the panel's reliance on policy alone, the Court explained that it had "no occasion to decide what contractual basis" was required. Id., at 687, n. 10, 130 S.Ct. 1758 (emphasis added); see Oxford Health Plans LLC v. Sutter , 569 U.S. 564, 571, 133 S.Ct. 2064, 186 L.Ed.2d 113 (2013) ("We overturned the arbitral decision [in Stolt-Nielsen ] because it lacked any contractual basis for ordering class procedures," not because it relied on an inadequate one).

Indeed, parts of Stolt-Nielsen -as well as later decisions-indicate that applying the anti-drafter rule to ambiguous language provides a sufficient contractual basis for class arbitration. In Stolt-Nielsen , we faulted the arbitrators for failing to inquire whether the relevant law "contain[ed] a default rule" that would construe an arbitration clause "as allowing class arbitration in the absence of express consent." 559 U.S. at 673, 130 S.Ct. 1758 (internal quotation marks omitted). We thus implied that such a default rule-like the anti-drafter canon here-can operate to authorize class arbitration when an agreement's language is ambiguous. And that is just how Concepcion (the other decision the majority relies on, see ante, at ---- ----, ---- - ----) understood Stolt-Nielsen 's reasoning. Said Concepcion : We held in Stolt-Nielsen "that an arbitration panel exceeded its power [by] imposing class procedures based on policy judgments rather than the arbitration agreement itself or some background principle of contract law that would affect its interpretation." 563 U.S. at 347, 131 S.Ct. 1740 (emphasis added); see Oxford Health, 569 U.S. at 571, 133 S.Ct. 2064 (similarly noting that Stolt-Nielsen criticized the arbitrators for failing to consider whether a "default rule" resolved the class arbitration question (internal quotation marks omitted)). The Court has thus (rightly) viewed the use of default rules as a run-of-the-mill aspect of contract interpretation, which (so long as neutrally applied) can support class arbitration.

And nothing particular to the anti-drafter rule justifies a different conclusion, as the majority elsewhere suggests, see ante, at ---- - ----.^[7] That rule, proclaims the[*1434] majority, reflects "public policy considerations," rather than "help[ing] to interpret the meaning of a term" as understood by the parties. Ante, at ----. The majority here notes that some commentators have viewed some equitable factors as supporting the rule, see ante, at ---- - -----which is no doubt right. But see 11 R. Lord, Williston on Contracts § 30:1, p. 11 (4th ed. 2012) (Williston) (stating that the rule is not justified by public interest considerations). But if the majority means to claim-as it must to prove its point-that the anti-drafter rule has no concern with what "the part[ies] agreed to," Stolt-Nielsen , 559 U.S. at 684, 130 S.Ct. 1758, then the majority is flat-out wrong. From an ex ante perspective, the rule encourages the drafter to set out its intent in clear contractual language, for the other party then to see and agree to. See Ayres & Gertner, 99 Yale L. J., at 91, 105, n. 80 (stating the modern view); 2 W. Blackstone, Commentaries on the Laws of England 380 (1766) (anticipating that view by 200-plus years). And from an ex post perspective, the rule enables an interpreter to resolve any remaining uncertainty in line with the parties' likely expectations. See 11 Williston § 30:1, at 11. Consider this very contract. Lamps Plus, knowing about the anti-drafter rule, still chose not to include a term prohibiting class arbitration. And Varela, seeing only the language sending "any and all disputes, claims, or controversies" to arbitration, had no reason to think class disputes barred. Cf. ibid. ("[T]he party addressed will understand ambiguous language in the sense most favorable to itself"). The upshot is that the rule (as this Court recognized in another arbitration case) protects against "unintended" consequences. Mastrobuono , 514 U.S. at 63, 115 S.Ct. 1212.

And even if that were not so evident, the FAA does not empower a court to halt the operation of such a garden-variety principle of state law. Nothing in the Act's text requires the displacement of state contract rules, as the majority implicitly concedes. See ante, at ----. Nor do the Act's purposes, so long as the state rule (as is true here) extends to all contracts alike, without disfavoring arbitration. See supra, at ---- - ----. The idea that the FAA blocks a state rule satisfying that standard because (a court finds) the rule has too much "public policy" in it comes only from the majority's collective mind. That approach disrespects the preeminent role of the States in designing and enforcing contract rules. It discards a universally accepted principle of contract interpretation in favor of unsupported assertions about what the parties must have (or could not possibly have) consented to. It subordinates authoritative state law to (at most) the impalpable emanations of federal policy, impossible to see except in just the right light.^[8]

[*1435] For that reason, it would never have graced the pages of the U.S. Reports save that this case involves ... class proceedings.

The heart of the majority's opinion lies in its cataloging of class arbitration's many sins. See ante, at 1416. In that respect, the opinion comes from the same place as (though goes a step beyond) this Court's prior arbitration decisions. See, e.g., Concepcion , 563 U.S. at 350, 131 S.Ct. 1740 (lamenting that class arbitration "greatly increases risks to defendants" by "aggregat[ing] and decid[ing] at once" the "damages allegedly owed to tens of thousands of potential claimants"); Epic Systems , 584 U.S., at ----, 138 S.Ct., at 1646 (similarly bemoaning the greater costs and complexity of class proceedings). The opinion likewise has more than a little in common with this Court's efforts to pare back class litigation. See, e.g., Comcast Corp. v. Behrend , 569 U.S. 27, 133 S.Ct. 1426, 185 L.Ed.2d 515 (2013) ; Wal-Mart Stores, Inc. v. Dukes , 564 U.S. 338, 348-360, 131 S.Ct. 2541, 180 L.Ed.2d 374 (2011). In this case, the result is to disregard the actual contract the parties signed. And to dismiss the neutral and commonplace default rule that would construe that contract against the drafting party. No matter what either requires, the majority will prohibit class arbitration. Does that approach remind you of anything? It should. Here (again) is Stolt-Nielsen as Concepcion described it: The panel exceeded its authority by "imposing class procedures based on policy judgments rather than the arbitration agreement itself or some background principle of contract law that would affect its interpretation." 563 U.S. at 347, 131 S.Ct. 1740 ; see supra, at 1433. Substitute "foreclosing" for "imposing" and that is what the Court today has done. It should instead-as the FAA contemplates-have left the parties' agreement, as construed by state law, alone.

Two intermediate California courts have held, based on similar language, that an arbitration agreement did not authorize class arbitration. See Nelsen v. Legacy Partners Residential, Inc. , 207 Cal. App. 4th 1115, 1129-1131, 144 Cal.Rptr.3d 198, 210-211 (2012) ; Kinecta Alternative Financial Solutions, Inc. v. Superior Court of Los Angeles Cty. , 205 Cal. App. 4th 506, 517-519, 140 Cal.Rptr.3d 347, 356-357 (2012), disapproved of on other grounds by Sandquist v. Lebo Automotive, Inc. , 1 Cal. 5th 233, 205 Cal.Rptr.3d 359, 376 P.3d 506 (2016).