U.S. state constitutional amendments banning same-sex unions

Many U.S. states enacted amendments to their state constitutions which prevented the recognition of some or all types of same-sex unions, but all such amendments were struck down by the Supreme Court of the United States on June 26, 2015, in the case of Obergefell v. Hodges. Some amendments prevented a state from legalizing same-sex marriage, civil unions and domestic partnerships, while others banned only same-sex marriage. By May 2012, voters in 30 states had approved such amendments. While the actual text of these amendments still remains written into the various state constitutions, the Obergefell decision has rendered them unenforceable insofar as they prevented same-sex couples from marrying.

Conservative activists who favor such amendments may refer to them as "defense of marriage amendments" or "marriage protection amendments." These state amendments are different from the proposed Federal Marriage Amendment, which would ban same-sex marriage in every U.S. state, and Section 2 of the Defense of Marriage Act, more commonly known as DOMA, which allowed the states not to recognize same-sex marriages from other states.

The idea of extending marriage rights to same-sex couples did not become a political issue in the United States until the 1990s. During that decade, several Western European countries legalized civil unions, and in 1993 the Supreme Court of Hawaii ruled in Baehr v. Lewin, 852 P.2d 44 (Haw. 1993), that refusing to grant marriage licenses to same-sex couples was sex-discrimination under that state's constitution. In response, voters passed Hawaii Constitutional Amendment 2. This amendment differed from future marriage amendments in other states as it did not ban same-sex marriage itself, but merely empowered the state legislature to enact such a ban. In November 1998, 69% of Hawaii voters approved the amendment, and the state legislature exercised its power to ban same-sex marriage. Only three constitutional bans on same-sex unions (in Alaska, Nebraska, and Nevada) were proposed between 1998 and 2003. All three amendments passed. In Massachusetts Supreme Judicial Court's November 2003 decision in Goodridge v. Department of Public Health, the court legalized same-sex marriage in Massachusetts. Social and religious conservatives feared that their own state supreme courts would issue such rulings at some point in the future; in order to prevent this, they proposed additional constitutional bans on same-sex marriage. The following year, eleven constitutional referenda banning same-sex unions were placed on state ballots.

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