Mr. Justice McKenna

delivered the opinion of the court.

This is the second action between the parties, defendant in error being plaintiff in both, and the purpose of both being the recovery of $332,750.98 upon an award of James H. McRoberts, chief engineer of the railroad company, made und.er the circumstances hereinafter detailed. In the present action the declaration contains a count upon a quantum meruit.

The first action was brought in the United States Circuit Cdurt for the Western District of Pennsylvania. A verdict was directed for the plaintiff (defendant in error here) for the full amount of the award, subject to the court’s decision upon a point reserved. Subsequently judgment; .non'obstante was entered for the defendant (plaintiff in error here). One of the grounds of the motion, and, as it was the only one considered, it is not necessary to give the others, was that the action could not be maintained because the plaintiff (defendant in error here) being a foreign corporation (it.was incorporated under the laws of West Virginia) did not register as required by the statutes of Pennsylvania, before making the contract on which the action was based.

An act passed' in 1874 provided that no foreign^corporation should do business in the State until it had established an office of offices and appointed an agent or agents for the transaction of business therein. And it was made unlawful for such corporation to do any business until it had filed in the office of the secretary of the Commonwealth a.statement, under seal, signed by the president and secretary, showing the title and object of the corpora *97 tion,'the location of its offices, and the names of its agents. A certificate of the secretary of the Commonwealth of such filing was required to be kept for public inspection in every office. Transacting business without complying with the provisions of the act was made a misdemeanor.

An act was passed in 1889 which provided that any limited partnership, bank or joint stock association organized under the laws of the Commonwealth, or under the laws of any other State and doing business in the Commonwealth, should register, in the office of the auditor general, the place of its business and post office address, the names of certain of its officers, and the amount of capital authorized and the amount paid. Such registration was also required of every corporation then engaged in business in the Commonwealth. Annual registration was required thereafter. A penalty of $500 was imposed for violations of the act.

The plaintiff had not registered at the time the contract involved in the action was made. It, however, subsequently registered.

It was held, following the decisions of the courts of Pennsylvania, that the statutes made unlawful business transactions within the State by a foreign corporation which had not complied with their provisions. And it was said:

“Nor does the award of the engineer have any efficacy in this case. Authority on his part to . act, and the obligation of parties to abide by-his decision, rests in both cases on the provisions of the contract which is contra legem. The law will not enforce an award which is on an illegal contract. Benton v. Singleton, 114 Alabama, 556.”

The opinion concluded as follows:

“Upon the whole, therefore, we are of the opinion that by reason of the non-registration of the plaintiff corporation prior to the contract here involved, the verdict for plaintiff cannot be sustained. Judgment will *98 therefore be entered in favor , of the defendant non obstante veredicto, but said judgment shall not bar any subsequent suit or proceeding by the plaintiff for services performed.”

The Circuit Court of Appeals, to which the case was carried, also expressed the view, applying, as it said, the decisions of the courts of the State, that the contract was illegal and its illegality made void the award made under it. The judgment of the Circuit Court was affirmed.

Then an act of the legislature of Pennsylvania was passed, entitled “An act validating contracts, bonds or obligations made by corporations of other States, without first having established known places of business and designating authorized agents for the ti’ansaction of their business within this Commonwealth, and providing for the enforcement of the same.” P. L. 205.

Thereupon this action was brought not only upon the award made by James H. Roberts, but also for work and labor done as upon a quantum meruit. Among other defenses the judgment in the United States Circuit Court was pleaded as a bar to the action, notwithstanding the act of May 23, 1907. The trial court was of opinion that the act “cured the defect in plaintiff’s contract,” and accordingly the judgment was not a bar to the action. The court also ruled against the other defenses, and entered judgment for plaintiff (defendant in error here). It was sustained by the Supreme Court of the State, on the ground that the adjudication in the Circuit Court “settled nothing-'with respect to the merits of this case; all that was there adjudicated was the plaintiff’s right to maintain its action as an unregistered foreign corporation.” The Supreme Court further decided that “the effect of the act of May 23, 1907, was to remove the impediment created by the prior act to the enforcement of the contract, and the plaintiff had at once acquired the right to maintain an action thereon.”

*99 The action of the state court deciding against the judgment of the United States Circuit Court as a bar constitutes the Federal question in the case, the contention of. plaintiff in error being that due faith and credit were denied the judgment. A motion, however, is made to dismiss the writ of error on the ground that no Federal question is presented by the record or alternatively to affirm the judgment.

The motion to dismiss is based on the contention that the judgment of the Circuit Court reserved to plaintiff a right of action for the services performed and that the Supreme Court of the State having decided that the present action was within the reservation, it gave, not denied, the same faith and credit it would have given to a state judgment rendered under similar circumstances.

When a party asserts that due faith and credit have not been given to a judgment rendered in an action between him and the other party he asserts a right under the Constitution of the United States, and necessarily this raises a Federal question. This is the assertion in the present case, and the consideration which the Supreme Court of Pennsylvania gave it demonstrates that it is not so far frivolous as to sustain a motion to dismiss. The motion is, therefore, denied. On the other hand, we cannot say that the motion to dismiss- is without color, and pass, therefore, to the merits for the determination of which a fuller statement of the facts becomes necessary.

The West Side Belt Railroad Company, which we shall refer to as the railroad company, entered into a contract, with one Petrie to construct an extension of its road. Petrie engaged to Construct and complete the proposed work in the manner and within the time called for by the specifications, and the railroad company agreed to páy for the work the sum of $400,000. The contract was dated April 25, 1901. On the twenty-fourth of May following, Petrie, with the consent of the railroad company, entered *100 into a contract with the Pittsburgh Construction. Company, referred to herein as thaconstruction company, to do the work. This contract was a transcript of the contract between Petrie and the railroad company, except as to the consideration. Following the signatiires of the parties this appears: “For value received, .the Westside Belt Company and John S. Scully and T. S. Barnsdall do hereby guarantee and become surety for the payment of the money mentioned in this contract as the same becomes düe and payable.”

Under the contract James H. McRoberts was made.the final arbitrator to determine all matters in dispute, and disputes arose which were submitted to him. He after full hearing mdde an award in favor of the construction company in the sum of $332,750.98.

The construction company brought the action to which we have referred in’the Circuit Court of the United States against the railroad company, Scully and Barnsdall, on their contract of guaranty for the amount of the award. The proceedings in the Circuit Court and its judgment and that of the Circuit Court of Appeals have been stated.

An act of May 23, 1907, mentioned above, provided that contracts made by foreign corporations should be binding, and might be enforced in the courts of the Commonwealth, provided the corporation had subsequently and prior to the passage of the act complied -with the laws of the Commonwealth by establishing a known place of business in. the State and designating authorized agents for the transaction of its business, and before commencing any suit upon such contract, bond, or obligation and had paid all taxes that would have accrued to the Commonwealth if it had complied with the laws at the time of beginning business.

After the passage of the act this action was brought. The declaration contained two counts, on^ for the recovery of the sum of $332,750.98, with interest, for services per *101 formed and materials furnished, conclusively evidenced by the award of James H. McRoberts, and the other upon a quantum meruit for the value of the work done and materials furnished,, as of the date of the performing and furnishing the same. Judgment was rendéred ;for the construction company, as we have stated.

The decision in this case turns upon a comparison of the two actions, and the effect of the act of May 23,1907.

It was assumed by the trial court, and also by the Supreme Court, that the action in the Circuit Court was between the same parties and upon the same cause of action as this one. Making that assumption, the trial, court said the question was, Did the act of May 23 “revitalize the contract, which the United States court declared invalid?” And, construing the statute, decided that it was its intention to legalize every contract, bond or obligation off a foreign corporation which had not com: plied with the laws of the State, but subsequently had done so and paid all of the taxes which would have accrued. “The act makes no distinction,” the court said, “between contracts which have been litigated and those which have not been litigated,” and as it was found that the plaintiff (defendant in error) had complied with all the requirements of the statute, it was held that the defect in the contract was cured and the judgment of the Circuit Court was no bar to recovery. The Supreme Court pronounced the ruling correct, and, we may assume, approved the grounds upon which it was based. It is true the learned court discussed the judgment more than it did the act of May 23; but this, we infer, was for the purpose of showing that the judgment in the Circuit Court was rendered, not upon the controversies which arose between the parties in consequence of the contract, its terms, the extent or manner of its performance or the liability ©f the railroad company upon its contract of guaranty, but “was? based,” as the court said, “exclusively on the *102 plaintiff’s disability to maintain the action because, of its failure to register within the State before the contract sued upon was entered into,” and that, therefore, the judgment did not preclude a consideration of the act of May 23 .or take from it the power to “revitalize” the contract. We agree, therefore, with the railroad company that'the effect of the act of May 23 constitutes “the real and only issue in the ease.”

That the action could be maintained without it is not contended. It is true that the declaration contained a count upon a quantum meruit, in order to bring the case within the reservation of the judgment of the Circuit Court, but. evidence to sustain it was ruled out upon the objection of plaintiff in error, on the ground substantially that the contract furnished its own measure of damages, “ascertained in the manner set forth” in the contract, that is, by an appraisement and award, and that the evidence offered was a “contradiction of the written contracts in the case,” and therefore incompetent; The quantum meruit, therefore, is out of the case, and the action rests on the contract, as the action in the Circuit Court did, and the judgment in the latter, adjudging its invalidity, is a bar to the present action, unless such effect has been taken from it by the act of May 23, 1907. And this is admitted. Indeed, defendant in error asserts that it was assumed by everybody at the trial, but it is insisted that the effect of the act is not a Federal question, but solely one for the state courts. In this we cannot concur. It is an element in the consideration of the question whether due faith and credit were given to the judgment of the Circuit Court, and we are brought to the consideration of the curative effect of the act.

In Walson v. Mercer, 8 Pet. 88, such an act was sustained against a charge that it divested vested rights and impaired the obligation of a contract. The act considered made, valid, the deeds of married women which were invalid *103 by reason of defective acknowledgments, and avoided a judgment in ejectment rendered against one of the parties to the action because of such a defect in a deed relied on for title. The controversy Was between the successor by descent of the married woman and the grantee in the deed.. It was said in the argument that the descents had been confirmed by two judgments of the .Supreme Court of the State against the deed, adjudicating it to be void on points involving its validity, which judgments, it was contended, were conclusive evidence that the deed was no deed, and that the rights acquired by descent were absolute vested rights. The act was nevertheless sustained, as we have stated.

Satterlee v. Matthewson, 2 Pet. 380, is to the same effect. Title was set up as a defense in an action of ejectment to which the plaintiff replied that, conceding it to be older and better than his, it nevertheless could not be set up against him as the defendant was his tenant. The trial court took that view and the Supreme Court of the State reversed it on the ground that by the statute law of the State the relation of landlord and tenant could not subsist under a Connecticut title. Before the second trial of the case the legislature of the State (Pennsylvania) passed a law providing that the relation of landlord , and tenant should exist under such titles. This court affirmed the judgment of the Supreme Court of the State sustaining the. law.

The doctrine of Satterlee v. Matthewson and Walson v. Mercer was repeated in Randall v. Kreiger, 23 Wall. 137, 150.

In Gross v. United States Mortgage Company, 108 U. S. 477, the same principles were applied to sustain an act of the State of Illinois making valid a mortgage which was inoperative under the provisions of prior laws. So also Ewell v. Daggs, 108 U. S. 143.

In Utter v. Franklin, 172 U. S. 416, it was decided that *104 an act of Congress validating a defect in bonds of -the Territory of Arizona was within the power of Congress.

The principle of the cases is declared to be by Mr. Justice Matthews, in Ewell v. Daggs, supra, “that the right of a defendant to avoid his contract is given to him by statute, for purposes of its own, and not because it affects the merits of his obligation, and that whatever the statute gives, under such circumstances, as long as it remains in fieri, and not realized by having passed into a completed transaction, may, by a subsequent statute, be taken away. It is a privilege that belongs to the remedy and forms no element in the rights that inhere in the contract.” And such view of curative statutes is entertained by the Supreme Court of Pennsylvania, as indicated by its opinion in the present case and the cases there cited.

The Federal question having been correctly decided, the judgment is Affirmed.