In 2002, the Williamson family, riding in their 1993 Mazda minivan, was struck head-on by another vehicle. Thanh Williamson was sitting in a rear aisle seat, wearing a lap belt; she died in the accident. Delbert and Alexa Williamson were wearing lapand- shoulder belts; they survived. Thanh’s estate brought suit in a California state court to recover from Mazda for her wrongful death. The basis of the suit was that Mazda should have installed lapand- shoulder belts on all seats, including the rear aisle seats, and that Thanh died because Mazda equipped her seat with only a lap belt instead. Federal safety requirements do not require lapand- shoulder belts except for seats located next to doors and windows. Middle seats (aisle) can have a lap belt only. Mazda asked for a dismissal on the grounds that allowing Thanh’s estate to recover would contradict federal law and that federal law preempts state tort laws on product liability. The trial court dismissed the suit as preempted by federal law, and the Court of Appeal affirmed. The U.S. Supreme Court granted certiorari. What should the court decide and why? [Williamson v. Mazda Motor of America, Inc., 562 U.S. 323]