General jurisdiction

General jurisdiction lets a court hear claims against a defendant even when the claims have nothing to do with the defendant's activity in the state. For a person, this usually means the state where they live. For a company, the Supreme Court has narrowed it to the state where the company is incorporated and the state of its principal place of business, except in rare cases. Just doing a lot of business in a state is no longer enough by itself to create general jurisdiction. When general jurisdiction applies, the defendant can be sued in that state on any claim.