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first declared the prohibition invalid because of its unequal treatment of interracial couples. It stated: “There can be no doubt that restricting the freedom to marry solely because of racial classifications violates the central meaning of the Equal Protection Clause.” 388 U. S., at 12. With this link to equal protection the Court proceeded to hold the prohibition offended central precepts of liberty: “To deny this fundamental freedom on so unsupportable a basis as the racial classifications embodied in these statutes, classifications so directly subversive of the principle of equality at the heart of the Fourteenth Amendment, is surely to deprive all the State’s citizens of liberty without due process of law.” Ibid. The reasons why marriage is a fundamental right became more clear and compelling from a full awareness and understanding of the hurt that resulted from laws barring interracial unions.

The synergy between the two protections is illustrated further in Zablocki. There the Court invoked the Equal Protection Clause as its basis for invalidating the challenged law, which, as already noted, barred fathers who were behind on child-support payments from marrying without judicial approval. The equal protection analysis depended in central part on the Court’s holding that the law burdened a right “of fundamental importance.” 434 U. S., at 383. It was the essential nature of the marriage right, discussed at length in Zablocki, see id., at 383–387, that made apparent the law’s incompatibility with requirements of equality. Each concept—liberty and equal protection—leads to a stronger understanding of the other.

Indeed, in interpreting the Equal Protection Clause, the Court has recognized that new insights and societal understandings can reveal unjustified inequality within our most fundamental institutions that once passed unnoticed and unchallenged. To take but one period, this occurred with respect to marriage in the 1970’s and 1980’s. Notwithstanding the gradual erosion of the doctrine of