The 1937 Restatement of Restitution introduced a new branch of law focused on unjust enrichment. The recent Restatement (Third) builds on this by providing an updated overview of American law on this topic, aligning closely with Canadian law. It organizes the subject similarly to the 1937 version, emphasizing the principle against unjust enrichment. The new Restatement includes modernized treatments of remedies and defenses, effectively integrating common law and equitable doctrines.