From 1915 to 1961, decisions of the Puerto Rico Supreme Court could be appealed to the United States Court of Appeals for the First Circuit. In earlier years, the First Circuit frequently reversed the Puerto Rico Supreme Court, sometimes attempting to impose its own interpretations of Puerto Rico's civil law legal norms despite the Boston-based court's unfamiliarity with Puerto Rico jurisprudence, until a series of opinions by United States Supreme Court Justice Oliver Wendell Holmes instructed that the Puerto Rico Supreme Court's interpretations were not to be overturned by the federal appeals court unless they were "manifestly wrong."
