On the lighter side of the news: according to this report, owing to a slight omission in the drafting of North Dakota’s constitution (namely, the omission of a requirement that state officials take an oath of office), it is questionable whether North Dakota is legally a state.
The report mentions the existence of a conflict between the federal and state constitutions but isn’t more specific than that. If there is such a problem, it would presumably stem from the requirement in Article VI that “all executive and judicial Officers, both of the United States and of the several States, shall be bound by Oath or Affirmation, to support this Constitution”.
For a more skeptical take, see this report instead.