Hertz Corp. v. Friend is a pivotal Supreme Court case that clarified the standards for determining a corporation's principal place of business, which is essential for assessing diversity jurisdiction in federal court. This case established that a corporation's principal place of business is typically where its high-level officers direct, control, and coordinate its activities, often referred to as the 'nerve center.' Understanding this case helps in grasping how federal courts establish jurisdiction based on parties' citizenship and the implications for businesses operating across state lines.