What follows is an opinion from the Supreme Court of the United States. Your task is to determine the bases on which the Supreme Court rested its decision with regard to the legal provision that the Court considered in the case. Consider "judicial review (national level)" if the majority determined the constitutionality of some action taken by some unit or official of the federal government, including an interstate compact. Consider "judicial review (state level)" if the majority determined the constitutionality of some action taken by some unit or official of a state or local government. Consider "statutory construction" for cases where the majority interpret a federal statute, treaty, or court rule; if the Court interprets a federal statute governing the powers or jurisdiction of a federal court; if the Court construes a state law as incompatible with a federal law; or if an administrative official interprets a federal statute. Do not consider "statutory construction" where an administrative agency or official acts "pursuant to" a statute, unless the Court interprets the statute to determine if administrative action is proper. Consider "interpretation of administrative regulation or rule, or executive order" if the majority treats federal administrative action in arriving at its decision.Consider "diversity jurisdiction" if the majority said in approximately so many words that under its diversity jurisdiction it is interpreting state law. Consider "federal common law" if the majority indicate that it used a judge-made "doctrine" or "rule; if the Court without more merely specifies the disposition the Court has made of the case and cites one or more of its own previously decided cases unless the citation is qualified by the word "see."; if the case concerns admiralty or maritime law, or some other aspect of the law of nations other than a treaty; if the case concerns the retroactive application of a constitutional provision or a previous decision of the Court; if the case concerns an exclusionary rule, the harmless error rule (though not the statute), the abstention doctrine, comity, res judicata, or collateral estoppel; or if the case concerns a "rule" or "doctrine" that is not specified as related to or connected with a constitutional or statutory provision. Consider "Supreme Court supervision of lower federal or state courts or original jurisdiction" otherwise (i.e., the residual code); for issues pertaining to non-statutorily based Judicial Power topics; for cases arising under the Court's original jurisdiction; in cases in which the Court denied or dismissed the petition for review or where the decision of a lower court is affirmed by a tie vote; or in workers' compensation litigation involving statutory interpretation and, in addition, a discussion of jury determination and/or the sufficiency of the evidence.

Opinion:
UNITED STATES v. LOUISIANA.
No. 11,
Original.
Argued April 8, 1957.
Decided June 24, 1957.
Solicitor General Rankin argued the cause for the United States, plaintiff. With him on the brief were Attorney General Brownell, Oscar H. Davis, John F. Davis, George S. Swarth and Fred W. Smith.
Jack P. F. Gremillion, Attorney General, W. Scott Wilkinson, Special Assistant Attorney General, and Victor A. Sachse argued the cause for the State of Louisiana, defendant. With them on the brief were Edward M. Carmouche and John L. Madden, Special Assistant Attorneys General, Bailey Walsh, Hugh M. Wilkinson and Marc Dupuy, Jr.
By leave of the Court, 353 U. S. 980, Price Daniel, Governor, Will Wilson, Attorney General, James H. Rogers, Assistant Attorney General, and J. Chrys Dough-erty filed a brief for the State of Texas, as amicus curiae, urging that the Court’s decision in this case should be limited to the State of Louisiana.
Per Curiam.
The Court has before it the motions of the United States for judgment and of Louisiana for leave to take depositions. As a result of its consideration of these matters, including the representations made by the State of Texas in its amicus curiae brief, the Court is of the opinion that the issues in this litigation are so related to the possible interests of Texas, and other States situated on the Gulf of Mexico, in the subject matter of this suit, that the just, orderly, and effective determination of such issues requires that they be adjudicated in a proceeding in which all the interested parties are before the Court.
Accordingly, to that end, the Court, acting pursuant to Rules 9 (2) and (6) of its Revised Rules, Rule 21 of the Federal Rules of Civil Procedure, and the general equity powers of the Court, grants leave to each of the States of Alabama, Florida, Mississippi, and Texas to intervene in this suit within 60 days from the date of this opinion, with leave to the United States, within 60 days thereafter, to file an amended or supplemental complaint adding as parties to this suit any of such States as shall not have so intervened. The bringing in of such additional parties shall be without prejudice to the present motions of the United States and Louisiana, subject only to such terms as justice may require vis-á-vis the additional parties. Meanwhile such motions are continued.
The Chief Justice and Mr. Justice Clark took no part in the consideration or decision of this case.

Question: What is the basis of the Supreme Court's decision?

Choices:
judicial review (national level)
judicial review (state level)
Supreme Court supervision of lower federal or state courts or original jurisdiction
statutory construction
interpretation of administrative regulation or rule, or executive order
diversity jurisdiction
federal common law

Answer: 2