Personal jurisdiction doctrine is broken, but there is a moment of opportunity to repair it. The Supreme Court has struggled for decades to explain why constitutional law sometimes prevents states from providing local remedies for local injuries. Basic questions lack satisfying answers. Should doctrine emphasize liberty or federalism? Is the Due Process Clause the proper foundation for limits on state power or are other clauses more relevant? What harms should limits on state power prevent and what harms should limits avoid creating? Decisions addressing these questions rely on jargon rather than a coherent account of how to allocate jurisdictional power in a federal system. Reform may be possible. In 2021, the Court decided Ford Motor Co. ...