Mr. Justice Strong
delivered the opinion of the court.
It has not been seriously contended during the argument that the United States government is without power -to appropriate lands or other property within the States for its own uses, and to enable it to perform its proper functions. Such an authority is essential to its independent existence and perpetuity. These cannot be preserved if the obstinacy of a private person, or if any other authority, can prevent the acquisition of the means or instruments by which alone governmental functions can be performed. The powers vested by, the Constitution in the general government demand for their exercise the acquisition of lands in all the States. These are needed for forts, armories, and arsenals, for navy-yards and light-houses, for' custom-houses, post-offices, and court-houses, and for other public uses.' If the right to'acquire property for such uses may be made a barren right 'by 1¡]ie unwillingness of property-holders to sell, or by the action of a State prohibiting a sale to the Federal government, the constitutional grants of power may be rendered nugatory, and the government is dependent for its practical existence upon the will of a State, or even upon that of a private citizen. This cannot be. No one doubts the existence in the State governments of the right of eminent domain, — a right distinct from and paramount to the right of ultimate ownership. It grows out of the necessities of their being, not out of the tenure by Whifh lands are held. It may be exercised, though the lands are not held by grant from the government, either mediately or immediately, and independent of the consideration whether they would escheat to the government in case of a failure of heirs. The right is the offspring of political necessity; and it is inseparable from sovereignty, unless denied to it by its fundamental law. Yattel, c. 20, 34; Bynk., lib. 2, c. 15; Kent's Com. 338-340; Cooley on Const. Lim. 584 et seq. But it is no more necessary for the exercise of the powers of a State government than it is for the exercise of the conceded powers of the Federal government. That government is as sovereign within its sphere as-the States are within theirs. True, its sphere is limited. Certain subjects only are committed to it; but its power over those subjects is as full and complete as is the power of the States over the subjects to which their sovereignty extends. The power is not changed by its transfer to another holder.
•But, if ijhé right of eminent domain exists in the Federal government, it is a right which may be exercised within the States, so far as is necessary to 'the enjoyment of the powers conferred upon if by the Constitution. In Ableman v. Booth, 21 How; 523, Chief Justice Taney described in plain language the complex nature of our government, and the existence of two distinct and separate sovereignties within the same territorial space, each of them restricted in its powers, and each, within its sphere of action prescribed by the Constitution of the' United States, independent of the other. Neither is under the necessity of applying to the other for permission to exercise its lawful powers. Within its own sphere, it may employ all the-agencies for exerting them which are appropriate or necessary, and which are not forbidden by the law of its being. When the power to establish post-offices and to create courts within the States was conferred upon the Federal government, included in it was authority to obtain sites for such offices and for court-houses, and to obtain them by such means' as were known and appropriate. The right of eminent domain was one of those means well known when the Constitution was adopted, and employed to obtain lands for public uses. Its existence, therefore, in the grantee of that power, oüght not' to be qúestioned. The Constitution itself contains an implied recognition of it beyond what may justly be implied from the express grants. The fifth amendment contains a provisión that private property shall not be taken for public use without just -.compensation. What is that but an implied assertion, that, on making just compensation, it may be taken? In Cooley on Constitutional Limitations, 526, it is said,—
" So far as the general government may deem it important to appropriate lands or other property for its own purposes, and to. enable it to perform its functions, — as must, sometimes be necessary in the case of .forts, light-houses, and military posts or roads, and other conveniences and necessities of government,— the general government may exercise the authority as well within the States as within the territory under its exclusive jurisdiction : and its right to do so may be supported by the same reasons which -support the right' in any case; that is to say, the absolute necessity that the means in the government for performing its functions and perpetuating its existence should not be liable to be controlled or defeated by the want of consent of private parties or of any other authority."
We refer also to Trombley v. Humphrey, 23 Mich. 471; 10 Pet. 723; Dickey v. Turnpike Co., 7 Dana, 113; McCullough v. Maryland, 4 Wheat. 429.
It is true, this power of the Federal government has not heretofore been exercised adversely; but the non-user of a power does not disprove its existence. In some instances, the ' States, by virtue of their own right of eminent domain, have condemned lands for the use of the general government, and such condemnations have been sustained by their courts, without; however, denying the right of the United States to act independently of the States. Such was the ruling in Gilmer v. Lime Point, 18 Cal. 229, where lands were condemned by a proceeding in a State court and under a State law "for a United States fortification. A similar decision was made in Burt v. The Merchants' Ins. Co., 106 Mass. 356, where land was taken under a State law as a site for a post-office and sub-treasury building. Neither of these cases denies the- right of the Federal government to have lands in the States condemned for its uses under its own power and by its own action. The question was, whether the State could take lands for any other public' use than that of the State. In Trombley v. Humphrey, 23 Mich. 471, a different doctrine was, asserted, founded, we think, upon better reason. The proper view of the right of eminent domain seems to be, that it is a right belonging to a sovereignty to take private property for its own public uses, and not for those of another. . Beyond that, there exists no necessity; which alone is the foundation of the right. If the United States have' the power, it must be complete in itself. It can neither be enlarged nor diminished by a State. Nor can any State prescribe the manner in which it must be exercised. The consent of a State can never be a condition precedent to its enjoyment. Such consent is needed only, if at all, for the transfer of jurisdiction and of the right of exclusive legislation after the land shall have been acquired.
It may, therefore,.fairly be concluded that the proceeding in the case we have in hand was a proceeding by the United States government in its own right, and by virtue of its own eminent .domain.' The act' of Congress of March-2,1872, 17 Stat. 39, gave authority to the' Secretary of the Treasury to purchase a central and suitable site in the city .of Cincinnati, Ohio, for the erection of a building for the accommodation of the United States courts, custom-house, United States depository, post-office, internal-revenue and pension offices, at a cost not exceeding $300,000; and a proviso to the act declared that no money shoukPbe expended in the purchase until the State of Ohio should cede its jurisdiction oyer the site, and relinquish to the United States the right to iJax the property. The authority here given Vas to purchase: If that were all, it might be doubted whether the right of eminent domain was intended to be invoked. It is true, the words " to purchase " might be construed as including the power to acquire by condemnation; for, technically, purchase includes all modes of acquisition other than that of descent. But generally, in statutes as in common use, the word is' employed in a sense not technical, only as meaning acquisition by contract between the parties, without governmental interference. That Congress intended more than this, is evident, however, in view of the subsequent and amendatory act .passed June 10,'1872, which made an appropriation " for the purchase- at private sale or by condemnation of the ground for a site " for the building. These provisions, connected as they are, manifest a clear intention to- confer upon .the Secretary of the Treasury power to acquire the grounds needed by the exercise of the national right of eminent do main, or by private purchase, at his discretion. Why speak of condemnation at all, if Congress had hot in view an exercise of the right of eminent domain, and did not intend to confer upon the secretary the right to invoke it ?
But if is contended on behalf of the plaintiffs in error that the Circuit Court had no jurisdiction of the proceeding. There is nothing in the. acts of 1872, it is true, that directs the process by which the contemplated condemnation should be effected, or which expressly authorizes a proceeding in the Circuit Court to secure it. Doubtless Congress might have provided a mode of taking the. land, and determining the compensation to be made, which would have been exclusive of all other modes. They might have prescribed in what tribunal or by what agents the taking and the ascertainment of the just compensation should be accomplished. The'mode might' have been by a commission, or it might have been referred expressly to the Circuit Court; but this, we think, was not necessary. The investment of the Secretary of the Treasury with power to -.obtain the land by condemnation, without prescribing the mode of exercising the power, gave, him also the power to obtain it by any means that were competent to adjudge a condemnation. The Judiciary Act of 1789 conferred upon the circuit courts of the United States jurisdiction of all suits at common.law of 'in equity, when the United States, or any officer thereof, suing under the authority of any act of Congress, are plaintiffs. If, then, a proceeding to take land for public uses by condemnation may be a suit at common law, jurisdiction of it. is vested in, the Circuit Court. That it is a " suit " admits of no question. In Weston v. Charleston, 2 Pet. 464, Chief Justice Marshall, speaking for this court, said, " The term [suit] is certainly a very comprehensive one, and is understood to apply to any proceeding in a court of justice by which an individual pursues that remedy which the law affords. ' The modes of proceeding may be various; but, if a right is litigated in a. court of justice, the proceeding by which the decision of the court is sought is a suit." A writ of prohibition has, therefore, been held to be a suit; so has a writ of right, of which the Circuit Court has jurisdiction (Green v. Liter, 8 Cranch, 229); so has habeas corpus. Holmes v. Jamison, 14 Pet. 564. When, in the eleventh section of the Judiciary Act of 1789, jurisdiction of suits of a civil nature at common law or in equity was given to the circuit courts, it was intended to embrace riot merely suits which the common law recognized as among its old and settled proceedings, but suits in which legal rights were to be ascertained and determined as distinguished from rights in equity, as well as suits in admiralty. The right of eminent domain always was a right at common law. It was not a right in equity, nor was it even the creature of a statute. The time of its exercise may have been prescribed by statute; but the right itself was superior to any statute. That it was not enforced through the agency of a jury is immaterial; for many civil as wpll as criminal proceedings at common law were without a jury. It is difficult, then, to see why a proceeding to take land in virtue of the government's, eminent domain, and determining the compensation to be made for it, is not, within the meaning of the statute, a suit at common law, when initiated in a court. It is an attempt to enforce a legal right. It is quite immaterial that Congress has not enacted that the compensation shall be ascertained in a judicial proceeding. That ascertainment is in its nature at least quasi judicial. Certainly no other mode than a .judicial trial has been provided.
. It is argued that the assessment of property for the purpose of taking i1< is in its nature like .the assessment of its value for the purpose of taxation. It is said they are both valuations of the property to be made as the legislature may prescribe,- to enable the government, in the one case, to take the whole of it, and m the other to take á part of it for public uses; and it is argued .that no one but Congress could prescribe in' either case that the valuation should be made in a judicial- tribunal or in a judicial proceeding, although it is admitted that the legislature might authorize the valuation to be thus made in either ease. If the supposed analogy be admitted, it proves nothing. Assessments for taxation are specially provided for, and a mode is prescribed. No other is, therefore, admissible. But there is no special provision for ascertaining the just compensation to be inade for land taken. That is left to the ordinary processes of the law; 'and hence, as the government is a suitor for the property under a claim of legal right to take it, there appears to be no reason for holding that the proper Circuit Court has not jurisdiction of the suit, under the general grant of jurisdiction made by the act of 1789.
The second assignment of error is, that the Circuit Court refused the demand of the defendants below, now plaintiffs in error, for a separate trial of the value of their estate in the property. They were lessees of one of the parcels sought to be taken, and they demanded a separate trial of the value of their interest; but the court overruled their demand, and required that the jury should appraise the value of the lot or parcel, and that the lessees should in the same trial try the value of their leasehold estate therein. In directing the course of the trial, the court required the lessor and the lessees each separately to state the nature of their estates to the jury, the lessor to offer his testimony separately, and the lessees theirs, and then the government to answer the testimony of the lessor and the lessees; and the court instructed the jury to find and return separately the value of the estates of the lessor and the lessees. It is of this that the lessees complain. They contend, that whether the proceeding is to be treated as founded on the national right of eminent domain, or on that of the State, its consent having been given by the enactment of the State legislature of Feb. 15, 1873 (70 Ohio Laws, 36, sect. 1), it was required .to conform to the practice and proceedings in the courts of the State in like cases. This requirement, it is said, was made by the act of Congress of June 1, 1872. 17 Stat. 522. But, admitting that .the court was bound to conform to the practice and proceedings in the State courts in. like cases, we do not perceive that any error was committed. Under the laws of Ohio, it was regular to institute a joint proceeding against all the owners of lots proposed to be taken (Giesy v. C. W. & T. R.R. Co., 4 Ohio St. 308); but the eighth section of the State statute gave to "the owner or owners of each separate parcel" the right to a separate trial. In such a case, therefore, a separate trial is the mode of proceeding in the State courts. The statute treats all the owners of a parcel as one party, and gives to them collectively a trial separate from the trial of the issues between' the government and the owners of other parcels. It hath, this extent; no more. . The court is not required to allow a separate triql to each owner of an estate or interest in each parcel, and no consideration of justice to those owners would be subserved by-it. The Circuit Court, therefore, gave to the plaintiffs in error all, if not more than all, they had a right to ask. The judgment of the Circuit Court is affirmed.