laws of the several states

Tompkins, a citizen of Pennsylvania, was injured on a dark night by a passing freight train of the Erie Railroad Company while walking along its right of way at Hughestown in that State. He claimed that the accident occurred through negligence in the operation or maintenance of the train. He asserted that he was rightfully on the premises as a licensee because he was on a commonly used beaten footpath which ran for a short distance alongside the tracks. He further alleged that he was struck by something which looked like a door projecting from one of the moving cars. To enforce that claim he brought an action in the federal court for southern New York, which had jurisdiction because the company is a corporation of that State. The Erie insisted that its duty to Tompkins was no greater than that owed to a trespasser. It contended, among other things, that its duty to Tompkins, and hence its liability, should be determined in accordance with the Pennsylvania law; that under the law of Pennsylvania, as declared by its highest court, persons who use pathways along the railroad right of way are to be deemed trespassers; and that the railroad is not liable for injuries to undiscovered trespassers resulting from its negligence, unless it be wanton or wilful. Tompkins denied that any such rule had been established by the decisions of the Pennsylvania courts. He contended that, since there was no statute of the State on the subject, the railroad's duty and liability is to be determined in federal courts as a matter of general law. The trial judge refused to rule that the Pennsylvania law precluded recovery. The jury brought in a verdict of $30,000. The judgment entered thereon was affirmed by the Circuit Court of Appeals, which held that it was unnecessary to consider whether the law of Pennsylvania was as contended, because the question was one not of local, but of general, law and that upon questions of general law the federal courts are free, in the absence of a local statute, to exercise their independent judgment as to what the law is. Because of the importance of the question whether the federal court was free to disregard the alleged rule of the Pennsylvania common law, the Supreme Court granted certiorari.

The petitioners were fourteen same-sex couples and two men whose same-sex partners were deceased. They lived in Michigan, Kentucky, Ohio, and Tennessee. Those states defined marriage as a union between one man and one woman under their constitutions and statutes. The petitioners filed suits in federal district courts in their home states. They sought marriage licenses or recognition of marriages lawfully performed elsewhere. James Obergefell and John Arthur traveled from Ohio to Maryland to marry aboard a medical transport plane because Arthur suffered from ALS; Obergefell later sought to be listed as surviving spouse on Arthur's death certificate. April DeBoer and Jayne Rowse, Michigan nurses, adopted three children but could not both serve as legal parents under state adoption rules. Army Reserve Sergeant Ijpe DeKoe and Thomas Kostura married in New York before DeKoe's deployment to Afghanistan and later settled in Tennessee. Each district court ruled in the petitioners' favor. The respondents appealed. The Sixth Circuit consolidated the cases and reversed the district court judgments. The petitioners sought certiorari, which the Supreme Court granted. Same-sex couples had begun establishing families after substantial cultural and political developments in the late twentieth century. Earlier litigation had addressed the legal status of gays and lesbians, including challenges that reached the Supreme Court in Bowers v. Hardwick and Lawrence v. Texas.