Strawbridge v. Curtiss

Strawbridge v. Curtiss (1806) was a foundational U.S. Supreme Court case establishing that federal courts cannot hear cases involving residents of different states unless there's a specific constitutional exception. The case involved residents from New York and Maryland who sued each other, but the Court ruled that diversity of state citizenship alone does not give federal courts jurisdiction—an important rule in shaping federal jurisdiction and ensuring such cases are handled appropriately.