291 U.S. 205 (1934)
Moore v. Chesapeake & Ohio Railway Co.
Does a case inherently present a substantial federal question warranting federal jurisdiction if it tangentially involves a federal issue?
For a federal court to assume jurisdiction based on a federal question, the issue presented must be substantial and central to resolving the case, rather than peripheral or incidental.
The United States Supreme Court held that the case did not present a substantial federal question sufficient to confer federal jurisdiction.
Moore v. Chesapeake & Ohio Railway Co. is significant because it reinforces the principle that not all cases with a federal element belong in federal court. This case highlights the policing role federal courts play in determining their jurisdictional boundaries, preventing overextension that could infringe upon state court authority. It instructs practitioners on the importance of distinguishing between substantial and incidental federal issues to properly assess federal jurisdiction.