On June 26, 2015 the Supreme Court decision in Obergefell v. Hodges added the United States to a growing list of nations that provide equal marriage rights to same-sex couples. In an impassioned majority opinion by Justice Anthony Kennedy, Obergefell overturned remaining state bans on marriage for same-sex couples and required all states to recognize marriages legally performed elsewhere. (I am among the historians of marriage whose amici curiae brief …