28 U.S.C. § 1391(b) is a federal statute that outlines the proper venue for civil actions in the United States, detailing where a lawsuit can be filed based on the relationship between the parties and the events giving rise to the claim. This statute ensures that defendants are not subjected to litigation in distant or inconvenient forums and provides clarity on the jurisdictional limits of federal courts. It plays a crucial role in balancing the interests of both plaintiffs and defendants when determining the most appropriate location for a trial.