Defense of Marriage Act (DOMA) — Overturned by Obergefell v. Hodges

The Defense of Marriage Act (DOMA) was a US federal law that defined marriage as between a man and a woman. It was struck down by the Supreme Court in 2013, and its relevance was further eliminated in 2015 when the court ruled that same-sex couples have a constitutional right to marry. This ruling effectively made DOMA's definition of marriage obsolete.