Iowa Mutual Insurance v. LaPlante

Petitioner, an Iowa insurance company, brought this action in Federal District Court against members of the Blackfeet Indian Tribe resident on the Tribe’s reservation in Montana. The asserted basis for federal jurisdiction was diversity of citizenship. At the time the action was initiated, proceedings involving the same parties and based on the same dispute were pending before the Blackfeet Tribal Court. The question before us is whether a federal court may exercise diversity jurisdiction before the tribal court system has an opportunity to determine its own jurisdiction

I

Respondent Edward…