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:
BALDASAR v. ILLINOIS
No. 77-6219.
Argued November 26, 1979
Decided April 22, 1980
Michael Mulder argued the cause for petitioner. With him on the briefs were Mary Robinson, Ralph Ruebner, and Peter Nolle.
Michael B. Weinstein, Assistant Attorney General of Illinois, argued the cause for respondent. With him on the brief were William, J. Scott, Attorney General, and Donald B. Mackay and Melbourne A. Noel, Jr., Assistant Attorneys General.
Solicitor General McCree, Assistant Attorney General Heymann, and Harriet S. Shapiro filed a brief for the United States as amicus curiae urging affirmance.
Per Curiam.
In Scott v. Illinois, 440 U. S. 367 (1979), the Court held that an uncounseled misdemeanor conviction is constitutionally valid if the offender is not incarcerated. This case presents the question whether such a conviction may be used under an enhanced penalty statute to convert a subsequent misdemeanor into a felony with a prison term.
Under Illinois law, theft “not from the person” of property worth less than $150 is a misdemeanor punishable by not more than a year of imprisonment and a fine of not more than $1,000. Ill. Rey. Stat., ch. 38, §§ 16-1 (e)(1), 1005-8-3 (a) (1), 1005-9-1 (a)(2) (1975). A second conviction for the same offense, however, may be treated as a felony with a prison term of one to three years. § 1005-8-1 (b) (5).
Thomas Baldasar, the petitioner, was convicted of misdemeanor theft in Cook County Circuit Court in May 1975. The record of that proceeding indicates that he was not represented by a lawyer and did not formally waive any right to counsel. Baldasar was fined $159 and sentenced to one year of probation. In November 1975 the State charged him with stealing a shower head worth $29 from a department store. The case was tried to a jury in Du Page County Circuit Court in August 1976. The prosecution introduced evidence of the prior conviction and asked that Baldasar be punished as a felon under the Illinois enhancement statute. Defense counsel objected to the admission of the 1975 conviction. She argued unsuccessfully that because Baldasar had not been represented by a lawyer at the first proceeding, the conviction was too unreliable to support enhancement of the second misdemeanor. App. 7-9. The jury returned a guilty verdict on the felony charge, and Baldasar was sentenced to prison for one to three years.
The Illinois Appellate Court affirmed by a divided vote. It emphasized that when the right to counsel in misdemeanor cases was recognized in Argersinger v. Hamlin, 407 U. S. 25 (1972), this Court confined that right to prosecutions that “ 'end up in the actual deprivation of a person’s liberty.’ ” 52 Ill. App. 3d 305, 307, 367 N. E. 2d 459, 462 (1977), quoting Argersinger, supra, at 40. The Illinois court rejected petitioner’s argument that the Sixth and Fourteenth Amendments prevented the imposition of the enhanced prison term. “The fact is,” the court wrote, “that [Baldasar] was sentenced to imprisonment for his second theft conviction only and not, as he suggests, sentenced again, and this time to imprisonment, for the first theft conviction.” 52 Ill. App. 3d, at 310, 367 N. E. 2d, at 463. The Supreme Court of Illinois denied leave to appeal, and we granted certiorari. 440 U. S. 956 (1979).
For the reasons stated in the concurring opinions, the judgment is reversed, and the case is remanded to the Appellate Court of Illinois, Second District, for further proceedings.
It is so ordered.

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: 1