191 Wis. 610, 211 N.W. 913 (Wis. 1927)
Kingston v. Chicago & Northwestern Railway is a foundational torts case addressing the classic multiple sufficient causes problem.
When two independent fires, each sufficient to destroy the plaintiff's property, merge and cause an indivisible loss, and one fire is shown to have been negligently set by the defendant while the other is of unknown origin, may the defendant be held liable for the entire damage?
Where independent forces concur to produce a single, indivisible harm, and each is sufficient on its own to bring about the injury, each negligent actor may be held liable for the entire harm as a joint tortfeasor. When a known negligent fire merges with a fire of unknown origin to cause an indivisible loss, the defendant remains liable for the full damage unless it affirmatively shows that the other fire was not set by a responsible human agency (e.g., was of purely natural origin). The substantial factor standard, rather than strict but-for causation, governs in multiple sufficient cause scenarios, and the burden to negate responsibility or permit apportionment rests with the defendant.
Yes. The railroad, whose negligence caused one of two sufficient fires that merged and destroyed the plaintiff's property, is liable for the entire loss; absent proof that the other fire was of non-responsible (natural) origin or a basis for apportionment, full recovery against the known tortfeasor is proper.
Kingston is a cornerstone case on multiple sufficient causes and forms the basis for the substantial factor doctrine in scenarios where the but-for test breaks down. It reinforces joint and several liability for indivisible harms and places the burden on defendants to establish a non-responsible concurrent cause or a principled apportionment. The case is frequently taught with Anderson v. Minneapolis and later Restatement provisions to illustrate how courts ensure that negligent actors do not escape responsibility simply because another sufficient cause also contributed to the same loss.