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, et al., Petitioners
v.
TEXAS, et al.
No. 15-674
Supreme Court of the United States
June 23, 2016.
Adam P. KohSweeney, Gabriel Markoff, Ward A. Penfold, Samuel Wilson, Mallory Jensen, Juan Camilo Méndez, Remi Moncel, O'Melveny & Myers LLP, San Francisco, CA, Darcy M. Meals, Jeremy R. Girton, O'Melveny & Myers LLP, Washington, DC, Thomas A. Saenz, Nina Perales, Mexican American Legal, Defense and Educational Fund, San Antonio, TX, Linda J. Smith, DLA Piper LLP, Los Angeles, CA, for Intervenors-Respondents Jane Does.
Ken Paxton, Attorney General of Texas, Charles E. Roy, First Assistant Attorney General, Scott A. Keller, Solicitor General, J. Campbell Barker, Deputy Solicitor General, Ari Cuenin, Alex Potapov, Assistant Solicitors General, Office of the Attorney General, Austin, TX, Luther Strange, Attorney General, of Alabama, Mark Brnovich, Attorney General of Arizona, Leslie Rutledge, Attorney General of Arkansas, Pamela Jo Bondi, Attorney General of Florida, Samuel S. Olens, Attorney General of Georgia, Lawrence G. Wasden, Attorney General of Idaho, Cally Younger, Joseph C. Chapelle, Peter J. Rusthoven, Derek Schmidt, Attorney General of Kansas, James D. "Buddy" Caldwell, Attorney General of Louisiana, Paul R. LePage, Governor of Maine, Bill Schuette, Attorney General, Drew Snyder, Timothy C. Fox, Attorney General of Montana, Douglas J. Peterson, Attorney General of Nebraska, Adam Paul Laxalt, Attorney General of Nevada, Robert C. Stephens, Wayne Stenehjem, Attorney General of North Dakota, Michael DeWine, Attorney General of Ohio, Eric E. Murphy, Co-counsel for the, State of Ohio, E. Scott Pruitt, Attorney General of Oklahoma, Alan Wilson, Attorney General of South Carolina, Marty J. Jackley, Attorney General of South Dakota, Herbert Slatery III, Attorney General and Reporter of Tennessee, Sean D. Reyes, Attorney General of Utah, Patrick Morrisey, Attorney General of West Virginia, Brad D. Schimel, Attorney General of Wisconsin.
Stevan E. Bunnell, General Counsel, U.S. Department of Homeland Security, Washington, DC, Donald B. Verrilli, Jr., Solicitor General, Benjamin C. Mizer, Principal Deputy Assistant, Attorney General, Ian Heath Gershengorn, Edwin S. Kneedler, Deputy Solicitors General, Beth S. Brinkmann, Deputy Assistant Attorney General, Zachary D. Tripp, Assistant to the Solicitor General, Douglas N. Letter, Scott R. McIntosh, Jeffrey Clair, William E. Havemann, Attorneys, Department of Justice, Washington, DC, for petitioners.
Luther Strange, Attorney General of Alabama, Mark Brnovich, Attorney General of Arizona, Leslie Rutledge, Attorney General of Arkansas, Pamela Jo Bondi, Attorney General of Florida, Samuel S. Olens, Attorney General of Georgia, Lawrence G. Wasden, Attorney General of Idaho, Ken Paxton, Attorney General of Texas, Jeffrey C. Mateer, First Assistant Attorney General, Scott A. Keller, Solicitor General, J. Campbell Barker, Deputy Solicitor General, Ari Cuenin, Alex Potapov, Assistant Solicitors General, Office of the Attorney General, Austin, TX, Cally Younger, Joseph C. Chapelle, Peter J. Rusthoven, Derek Schmidt, Attorney General of Kansas, Jeff Landry, Attorney General of Louisiana, Paul R. LePage, Governor of Maine, Bill Schuette, Attorney General, Drew Snyder, Timothy C. Fox, Attorney General of Montana, Doug Peterson, Attorney General of Nebraska, Adam Paul Laxalt, Attorney General of Nevada, Robert C. Stephens, Wayne Stenehjem, Attorney General of North Dakota, Michael DeWine, Attorney General of Ohio, Eric E. Murphy, E. Scott Pruitt, Attorney General of Oklahoma, Alan Wilson, Attorney General of South Carolina, Marty J. Jackley, Attorney General of South Dakota, Herbert Slatery III, Attorney General and Reporter of Tennessee, Sean D. Reyes, Attorney General of Utah, Patrick Morrisey, Attorney General of West Virginia, Brad D. Schimel, Attorney General of Wisconsin, for State Respondents.
PER CURIAM.
The judgment is affirmed by an equally divided Court.

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