In 2004, Massachusetts became the first state to issue marriage licenses to same-sex couples. In reaction, many states took measures to define marriage as existing between one man and one woman. By 2012, 31 states had amended their constitutions to prevent same-sex marriage, and 6 had legalized it. Bolstered by the repeal of DOMA, an additional 30 states legalized same-sex marriage between 2012 and 2015. On June 26, 2015, the U.S. Supreme Court declared all state bans on same-sex marriage unconstitutional in Obergefell v. Hodges.
