Cite as: 505 U. S. 833 (1992)
Opinion of the Court
Amendment applies to matters of substantive law as well as to matters of procedure. Thus all fundamental rights comprised within the term liberty are protected by the Federal Constitution from invasion by the States." Whitney v. California, 274 U. S. 357, 373 (1927) (concurring opinion). "[T]he guaranties of due process, though having their roots in Magna Carta's 'per legem terrae' and considered as procedural safeguards 'against executive usurpation and tyranny,' have in this country 'become bulwarks also against arbitrary legislation.' " Poe v. Ullman, 367 U. S. 497, 541 (1961) (Harlan, J., dissenting from dismissal on jurisdictional grounds) (quoting Hurtado v. California, 110 U. S. 516, 532 (1884)).
The most familiar of the substantive liberties protected by the Fourteenth Amendment are those recognized by the Bill of Rights. We have held that the Due Process Clause of the Fourteenth Amendment incorporates most of the Bill of Rights against the States. See, e. g., Duncan v. Louisiana, 391 U. S. 145, 147-148 (1968). It is tempting, as a means of curbing the discretion of federal judges, to suppose that liberty encompasses no more than those rights already guaranteed to the individual against federal interference by the express provisions of the first eight Amendments to the Constitution. See Adamson v. California, 332 U. S. 46, 68-92 (1947) (Black, J., dissenting). But of course this Court has never accepted that view.
It is also tempting, for the same reason, to suppose that the Due Process Clause protects only those practices, defined at the most specific level, that were protected against government interference by other rules of law when the Fourteenth Amendment was ratified. See Michael H. v. Gerald D., 491 U. S. 110, 127-128, n. 6 (1989) (opinion of Scalia, J.). But such a view would be inconsistent with our law. It is a promise of the Constitution that there is a realm of personal liberty which the government may not enter. We have vindicated this principle before. Marriage is mentioned nowhere in the Bill of Rights and interracial marriage was ille-
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