There is conflicting language between the North Dakota state constitution and the United States constitution, so technically, North Dakota might not be a U.S. state. Article XI of the U.S. Constitution requires a state to have its governor and several other top officials take an oath of office; North Dakota's state constitution does not have this requirement, which might technically disqualify it from statehood. Author John Rolczynski, the man who discovered the discrepancy in 1995, believes that North Dakota is still technically a territory and will remain so until its legislature adopts an amendment. A vote on whether to adopt the amendment was scheduled for November 2012.
More facts about North Dakota and statehood: