Final answer:
Addressability is not required for Article III standing, which consists of an injury-in-fact, causation, and redressability as the essential elements for a plaintiff to initiate a lawsuit in federal court.
Step-by-step explanation:
The question asks which of the listed factors is not required for Article III standing in the American judicial system. Article III standing is a set of criteria that a plaintiff must meet in order to initiate a lawsuit in federal court. The three essential elements required for Article III standing are: (1) the party has suffered an injury-in-fact, (2) there is a causal connection between the injury and the conduct complained of, so the injury is fairly traceable to the defendant's actions, and (3) it is likely, as opposed to merely speculative, that the injury will be redressed by a favorable court decision. Therefore, the factor that is not required for Article III standing is Addressability, as it is not a recognized term in the context of the standing doctrine. Instead, redressability is the correct term that relates to the court's ability to provide relief to the aggrieved party.