Mr. Justice Stewart
delivered the opinion of the Court.
Since the admission of California to the Union in 1850, the southeastern boundary of the State has been the middle of the channel of the Colorado River. Act of Sept. 9, 1850, 9 Stat 452. Neither the Gadsden Purchase in 1853 nor the admission of Arizona to statehood in 1912 changed the location of this 229-mile border. The location of the river did change, however, from causes both natural and artificial. These shifts created confusion about the location of the political boundary between California and Arizona. This problem was resolved through an interstate compact, ratified by the Congress in 1966.
The Compact fixed the boundary by stations of longitude and latitude, divorced from the continuing shifts of the Colorado River.
California has taken the position, however, that the Compact settled only questions of political jurisdiction, not questions of ownership of real property, since, under the “equal-footing doctrine,” California holds title to all lands beneath the navigable waters within its boundaries at the time of its admission to the Union.
Pollard’s Lessee
v.
Hagan,
3 How. 212, 219. See
Oregon ex rel. State Land Bd.
v.
Corvallis Sand & Gravel Co.,
429 U. S. 363. In the early 1970’s the California State Lands Commission made a study of a stretch of 11.3 miles along the river to determine what land California owns. Both Arizona and the United States have a direct interest in such a determination. Arizona, of course, has the same rights under the equal-footing doctrine as does California. The United States is the principal riparian owner in this region, and determination of the width and location of the old riverbed thus will necessarily affect its
property interests. California has presented the determinations of its Lands Commission to both Arizona and the United States; neither has acquiesced in the Commission’s conclusions.
California seeks to invoke the Court’s original jurisdiction in this suit to quiet title to the lands it claims, and thus resolve its dispute with Arizona and the United States.
To ■sue Arizona, it relies on 28 U. S. C. § 1251 (a), which confers on this Court “original and exclusive jurisdiction of . . . [a] 11 controversies between two or more States.” To sue the United States, it relies on 28 U. S. C. § 1251 (b), which confers on this Court “original but not exclusive jurisdiction of ... [a] 11 controversies between the United States and a State.” Both these heads of original jurisdiction find their source in Art. Ill, §2, of the Constitution: “In all Cases ... in which a State shall be Party, the supreme Court shall have original Jurisdiction.”
It is undisputed that both Arizona and the United States are indispensable parties to this litigation, and it is California’s need to sue both Arizona and the United States that creates the problem before us. Specifically, Arizona and the United States contend that the United States has not agreed to be a defendant in a quiet-title action in this Court Yet this is the only federal court in which California can sue Arizona, because Congress has conferred upon it “original and
exclusive
jurisdiction” (emphasis added) over controversies between States. 28 U. S. C. § 1251 (a)(1).
It is settled that the United States must give its consent to be sued even when one of the States invokes this Court’s original jurisdiction:
“It does not follow that because a State may be sued by the United States without its consent, therefore the
United States may be sued by a State without its consent. Public policy forbids that conclusion.”
Kansas
v.
United States,
204 U. S. 331, 342.
See
Oregon
v.
Hitchcock,
202 U. S. 60;
Minnesota
v.
Hitchcock,
185 U. S. 373, 387 (dicta). But cf.
United States
v.
Texas,
143 U. S. 621. Yet the Court has recognized that an action in equity cannot be maintained without the joinder of indispensable parties.
Shields
v.
Barrow,
17 How. 130;
Mallow
v.
Hinde,
12 Wheat. 193. Thus, if the United States has not consented to be sued in an action such as this, California’s motion for leave to file a complaint • must be denied. “A bill of complaint will not be entertained which, if filed, could only be dismissed because of the absence of the United States as a party.”
Arizona
v.
California,
298 U. S.
558, 572. See
Texas
v.
New Mexico,
352 U. S. 991; but see
Florida
v.
Georgia,
17 How. 478, 494-496 (Taney, C. J.).
The suit, then, could not be maintained in any court. This Court could not hear the claims against the United States because it has not waived its sovereign immunity, and a district court could not hear the claims against Arizona, because this Court has exclusive jurisdiction over such claims. To resolve this asserted dilemma, the Solicitor General has made an undertaking on behalf of the United States. He has agreed that, if California is granted leave to file its complaint in this Court against Arizona, the United States will intervene with respect to the controversy over part of the area in question.
Because, however, we have concluded that the United States has already waived its sovereign immunity to suit in this case, we need not assess the wisdom or validity of the Solicitor General's suggestion.
In 1972 Congress passed Pub. L. 92-562, 86 Stat. 1176. The Act made two relevant changes in Title 28 of the United States Code.
First, it created a new § 2409a.’
Subsection (a) of this new section provides:
“The United States may be named as a party defendant
in a civil action under this section to adjudicate a disputed title to real property in which the United States claims an interest, other than a security interest or water rights. . .
The remainder of the section defines the procedures to be followed in such suits. Second, the Congress amended 28 U. S. C.
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Mr. Justice Stewart
delivered the opinion of the Court.
Since the admission of California to the Union in 1850, the southeastern boundary of the State has been the middle of the channel of the Colorado River. Act of Sept. 9, 1850, 9 Stat 452. Neither the Gadsden Purchase in 1853 nor the admission of Arizona to statehood in 1912 changed the location of this 229-mile border. The location of the river did change, however, from causes both natural and artificial. These shifts created confusion about the location of the political boundary between California and Arizona. This problem was resolved through an interstate compact, ratified by the Congress in 1966.
The Compact fixed the boundary by stations of longitude and latitude, divorced from the continuing shifts of the Colorado River.
California has taken the position, however, that the Compact settled only questions of political jurisdiction, not questions of ownership of real property, since, under the “equal-footing doctrine,” California holds title to all lands beneath the navigable waters within its boundaries at the time of its admission to the Union.
Pollard’s Lessee
v.
Hagan,
3 How. 212, 219. See
Oregon ex rel. State Land Bd.
v.
Corvallis Sand & Gravel Co.,
429 U. S. 363. In the early 1970’s the California State Lands Commission made a study of a stretch of 11.3 miles along the river to determine what land California owns. Both Arizona and the United States have a direct interest in such a determination. Arizona, of course, has the same rights under the equal-footing doctrine as does California. The United States is the principal riparian owner in this region, and determination of the width and location of the old riverbed thus will necessarily affect its
property interests. California has presented the determinations of its Lands Commission to both Arizona and the United States; neither has acquiesced in the Commission’s conclusions.
California seeks to invoke the Court’s original jurisdiction in this suit to quiet title to the lands it claims, and thus resolve its dispute with Arizona and the United States.
To ■sue Arizona, it relies on 28 U. S. C. § 1251 (a), which confers on this Court “original and exclusive jurisdiction of . . . [a] 11 controversies between two or more States.” To sue the United States, it relies on 28 U. S. C. § 1251 (b), which confers on this Court “original but not exclusive jurisdiction of ... [a] 11 controversies between the United States and a State.” Both these heads of original jurisdiction find their source in Art. Ill, §2, of the Constitution: “In all Cases ... in which a State shall be Party, the supreme Court shall have original Jurisdiction.”
It is undisputed that both Arizona and the United States are indispensable parties to this litigation, and it is California’s need to sue both Arizona and the United States that creates the problem before us. Specifically, Arizona and the United States contend that the United States has not agreed to be a defendant in a quiet-title action in this Court Yet this is the only federal court in which California can sue Arizona, because Congress has conferred upon it “original and
exclusive
jurisdiction” (emphasis added) over controversies between States. 28 U. S. C. § 1251 (a)(1).
It is settled that the United States must give its consent to be sued even when one of the States invokes this Court’s original jurisdiction:
“It does not follow that because a State may be sued by the United States without its consent, therefore the
United States may be sued by a State without its consent. Public policy forbids that conclusion.”
Kansas
v.
United States,
204 U. S. 331, 342.
See
Oregon
v.
Hitchcock,
202 U. S. 60;
Minnesota
v.
Hitchcock,
185 U. S. 373, 387 (dicta). But cf.
United States
v.
Texas,
143 U. S. 621. Yet the Court has recognized that an action in equity cannot be maintained without the joinder of indispensable parties.
Shields
v.
Barrow,
17 How. 130;
Mallow
v.
Hinde,
12 Wheat. 193. Thus, if the United States has not consented to be sued in an action such as this, California’s motion for leave to file a complaint • must be denied. “A bill of complaint will not be entertained which, if filed, could only be dismissed because of the absence of the United States as a party.”
Arizona
v.
California,
298 U. S.
558, 572. See
Texas
v.
New Mexico,
352 U. S. 991; but see
Florida
v.
Georgia,
17 How. 478, 494-496 (Taney, C. J.).
The suit, then, could not be maintained in any court. This Court could not hear the claims against the United States because it has not waived its sovereign immunity, and a district court could not hear the claims against Arizona, because this Court has exclusive jurisdiction over such claims. To resolve this asserted dilemma, the Solicitor General has made an undertaking on behalf of the United States. He has agreed that, if California is granted leave to file its complaint in this Court against Arizona, the United States will intervene with respect to the controversy over part of the area in question.
Because, however, we have concluded that the United States has already waived its sovereign immunity to suit in this case, we need not assess the wisdom or validity of the Solicitor General's suggestion.
In 1972 Congress passed Pub. L. 92-562, 86 Stat. 1176. The Act made two relevant changes in Title 28 of the United States Code.
First, it created a new § 2409a.’
Subsection (a) of this new section provides:
“The United States may be named as a party defendant
in a civil action under this section to adjudicate a disputed title to real property in which the United States claims an interest, other than a security interest or water rights. . .
The remainder of the section defines the procedures to be followed in such suits. Second, the Congress amended 28 U. S. C. § 1346 to add a new subsection (f). That subsection provides:
“The district courts shall have exclusive original juris
diction of civil actions under section 2409a to quiet title to an estate or interest in real property in which an interest is claimed by the United States.”
It is thus clear that the United States has waived its immunity to suit in actions brought against it to quiet title to land. The question is whether suits brought under that waiver may be heard in this Court. The Solicitor General argues that they may not, that § 1346 (f) operates both to confer original jurisdiction over such a case on the federal district courts and simultaneously to withdraw the original jurisdiction of this Court. If this contention were accepted, a grave constitutional question would immediately arise. That question, quite simply, is whether Congress can deprive this Court of original jurisdiction conferred upon it by the Constitution.
The original jurisdiction of the Supreme Court is conferred not by the Congress but by the Constitution itself. This jurisdiction is self-executing, and needs no legislative implementation.
Kentucky
v.
Dennison,
24 How. 66, 96;
Florida
v.
Georgia,
17 How., at 492;
Martin
v.
Hunter’s Lessee,
1 Wheat. 304, 332. It is clear, of course, that Congress could refuse to waive the Nation’s sovereign immunity in all cases or only in some cases but in all courts. Either action would bind this Court even in the exercise of its original jurisdiction. It is similarly clear that the original jurisdiction of this Court is not constitutionally exclusive — that other courts can be awarded concurrent jurisdiction by statute.
Börs
v.
Preston,
111 U. S. 252;
Ames
v.
Kansas ex rel. Johnston,
111 U. S. 449. But once Congress has waived the Nation’s sovereign immunity, it is far from clear that it can withdraw the constitutional jurisdiction of this Court over such suits.
The constitutional grant to this Court of original jurisdiction is limited to cases involving the States and the envoys of foreign nations. The Eramers seem to have been concerned
with matching the dignity of the parties to the status of the court:
“The evident purpose [of the grant of original jurisdiction] was to open and keep open the highest court of the nation for the determination, in the first instance, of suits involving a State or a diplomatic or commercial representative of a foreign government. So much was due to the rank and dignity of those for whom the provision was made
. . . Id.,
at 464.
See The Federalist No. 81, pp. 507-509 (H. Lodge ed. 1888) (A. Hamilton). Elimination of this Court’s original jurisdiction would require those sovereign parties to go to another court, in derogation of this constitutional purpose. Congress has broad powers over the jurisdiction of the federal courts and over the sovereign immunity of the United States but it is extremely doubtful that they include the power to limit in this manner the original jurisdiction conferred upon this Court by the Constitution.
Happily, we need not decide this constitutional question, for the statute in question can readily be construed in such a way as to obviate it. In so construing the statute, we no more than follow the long practice of the Court to forgo the resolution of constitutional issues except when absolutely necessary. “When the validity of an act of the Congress is drawn in question, and even if a serious doubt of constitutionality is raised, it is a cardinal principle that this Court will first ascertain whether a construction of the statute is fairly possible by which the question may be avoided.”
Crowell
v.
Benson,
285 U. S. 22, 62.
The legislative history of § 1346 (f) is sparse, but the intent of Congress seems reasonably clear. The congressional purpose was simply to confine jurisdiction to the federal courts and to exclude the courts of the States, which otherwise might be presumed to have jurisdiction over quiet-title suits against the United States, once its sovereign immunity had been
waived.
Charles Dowd Box Co.
v.
Courtney,
368 U. S. 502;
Claflin
v.
Houseman,
93 U. S. 130, 136.
The legislative history shows no intention to divest this Court of jurisdiction over quiet-title actions against the United States in cases otherwise within our original jurisdiction. We find, therefore,
that § 1346 (f), by vesting “exclusive original jurisdiction” of quiet-title actions against the United States in the federal district courts, did no more than assure that such jurisdiction was not conferred upon the courts of any State.
For these reasons we conclude that there is no bar to this original suit in the Supreme Court between California as plaintiff, and Arizona and the United States as defendants.
Accordingly, the motion of California for leave to file its complaint is granted, and the defendants are allowed 45 days in which to answer or otherwise respond.
It is so ordered.