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see supra, at 6, invidious sex-based classifications in marriage remained common through the mid-20th century. See App. to Brief for Appellant in Reed v. Reed, O. T. 1971, No. 70–4, pp. 69–88 (an extensive reference to laws extant as of 1971 treating women as unequal to men in marriage). These classifications denied the equal dignity of men and women. One State’s law, for example, provided in 1971 that “the husband is the head of the family and the wife is subject to him; her legal civil existence is merged in the husband, except so far as the law recognizes her separately, either for her own protection, or for her benefit.” Ga. Code Ann. §53–501 (1935). Responding to a new awareness, the Court invoked equal protection principles to invalidate laws imposing sex-based inequality on marriage. See, e. g., Kirchberg v. Feenstra, 450 U. S. 455 (1981); Wengler v. ''Druggists Mut. Ins. Co., 446 U. S. 142 (1980); Califano v. Westcott, 443 U. S. 76 (1979); Orr v. Orr, 440 U. S. 268 (1979); Califano v. Goldfarb, 430 U. S. 199 (1977) (plurality opinion); Weinberger v. Wiesenfeld, 420 U. S. 636 (1975); Frontiero v. Richardson'', 411 U. S. 677 (1973). Like Loving and Zablocki, these precedents show the Equal Protection Clause can help to identify and correct inequalities in the institution of marriage, vindicating precepts of liberty and equality under the Constitution.

Other cases confirm this relation between liberty and equality. In M. L. B. v. S. L. J., the Court invalidated under due process and equal protection principles a statute requiring indigent mothers to pay a fee in order to appeal the termination of their parental rights. See 519 U. S., at 119–124. In Eisenstadt v. Baird, the Court invoked both principles to invalidate a prohibition on the distribution of contraceptives to unmarried persons but not married persons. See 405 U. S., at 446–454. And in Skinner v. ''Oklahoma ex rel. Williamson'', the Court invalidated under both principles a law that allowed