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4 Finally, this Court’s cases and the Nation’s traditions make clear that marriage is a keystone of the Nation’s social order. See Maynard v. Hill, 125 U. S. 190, 211. States have contributed to the fundamental character of marriage by placing it at the center of many facets of the legal and social order. There is no difference between same- and opposite-sex couples with respect to this principle, yet same-sex couples are denied the constellation of benefits that the States have linked to marriage and are consigned to an instability many opposite-sex couples would find intolerable. It is demeaning to lock same-sex couples out of a central institution of the Nation’s society, for they too may aspire to the transcendent purposes of marriage.

The limitation of marriage to opposite-sex couples may long have seemed natural and just, but its inconsistency with the central meaning of the fundamental right to marry is now manifest. Pp. 12–18.

(3) The right of same-sex couples to marry is also derived from the Fourteenth Amendment’s guarantee of equal protection. The Due Process Clause and the Equal Protection Clause are connected in a profound way. Rights implicit in liberty and rights secured by equal protection may rest on different precepts and are not always coextensive, yet each may be instructive as to the meaning and reach of the other. This dynamic is reflected in Loving, where the Court invoked both the Equal Protection Clause and the Due Process Clause; and in Zablocki v. Redhail, 434 U. S. 374, where the Court invalidated a law barring fathers delinquent on child-support payments from marrying. Indeed, recognizing that new insights and societal understandings can reveal unjustified inequality within fundamental institutions that once passed unnoticed and unchallenged, this Court has invoked equal protection principles to invalidate laws imposing sex-based inequality on marriage, see, e. g., Kirchberg v. Feenstra, 450 U. S. 455, 460–461, and confirmed the relation between liberty and equality, see, e. g., M. L. B. v. S. L. J., 519 U. S. 102, 120–121.

The Court has acknowledged the interlocking nature of these constitutional safeguards in the context of the legal treatment of gays and lesbians. See Lawrence, 539 U. S., at 575. This dynamic also applies to same-sex marriage. The challenged laws burden the liberty of same-sex couples, and they abridge central precepts of equality. The marriage laws at issue are in essence unequal: Same-sex couples are denied benefits afforded opposite-sex couples and are barred from exercising a fundamental right. Especially against a long history of disapproval of their relationships, this denial works a grave and continuing harm, serving to disrespect and subordinate gays and lesbians. Pp. 18–22.

(4) The right to marry is a fundamental right inherent in the liberty of the person, and under the Due Process and Equal