Opposition to same-sex marriage in the United States

In the United States, same-sex marriage is legal in all states, Washington, D.C., U.S. territories except American Samoa, but not on all Native American tribal lands. Same-sex marriage has been legal since June 26, 2015, when the United States Supreme Court ruled in Obergefell v. Hodges that state-level bans on same-sex marriage are unconstitutional. The court ruled that the denial of marriage licenses to same-sex couples and the refusal to recognize those marriages performed in other jurisdictions violates the Due Process and the Equal Protection clauses of the Fourteenth Amendment of the United States Constitution. The ruling overturned a 1972 precedent, Baker v. Nelson. Just prior to the Supreme Court's ruling in 2015, same-sex marriage was legal in many but not all U.S. jurisdictions.

While civil rights campaigning took place from the 1970s, the issue became prominent from around 1993, when the Hawaii Supreme Court ruled in Baehr v. Lewin that the prohibition was unconstitutional. The ruling led to federal actions and actions by several states, to restrict marriage to male-female couples, in particular the Defense of Marriage Act (DOMA). During the period of 2003 to 2015, various lower court decisions, state legislation, and popular referendums already legalized same-sex marriage to some degree in thirty-eight out of fifty U.S. states, in the U.S. territory of Guam, and in the District of Columbia. In 2013, the Supreme Court overturned a key provision of DOMA, declaring part of it unconstitutional and in breach of the Fifth Amendment in United States v. Windsor because it "single[d] out a class of persons" for discrimination, by refusing to treat their marriages equally under federal law when state law had created them equally valid. The ruling led to the Federal Government's recognition of same-sex marriage, with federal benefits for married couples connected to either the state of residence or the state in which the marriage was solemnized. However, the ruling focused on the provision of DOMA responsible for the Federal Government refusing to acknowledge state sanctioned same-sex marriages, leaving the question of state marriage laws itself to the individual states. The Supreme Court addressed that question two years later in 2015, ruling, in Obergefell, that same-sex married couples were to be constitutionally accorded the same recognition as opposite-sex couples at state/territory levels, as well as at federal level.

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