1. North Dakota Statehood Day: March 15, 1889, marks the day North Dakota became the 39th state of the United States, along with South Dakota, as part of the Dakota Territory.

2. The Mystery of the Mandan: On March 15, 1804, the Lewis and Clark Expedition arrived at the first of the Mandan villages, which was located near the present-day city of Bismarck, North Dakota. The Mandan people had distinctive and complex cultural practices, but within a century, the vast majority of the population succumbed to a mysterious epidemic estimated to have killed up to 90% of the tribe.

3. Worst Blizzard in History: On March 15, 1941, North Dakota was hit by a devastating blizzard that lasted three days and claimed the lives of 60 people. This was the worst blizzard on record in North Dakota and is remembered as one of the deadliest blizzards in American history.

4. Devil's Lake Flooding: On March 15, 1997, residents of Devil's Lake in North Dakota were forced to evacuate due to severe flooding caused by melting snow and heavy rain. The floodwaters persisted throughout the year, causing extensive damage to crops, buildings, and roads.

5. Birth of a Legend: On March 15, 1989, Carson Wentz, an American football quarterback, was born in Raleigh, North Dakota. Wentz went on to become a standout athlete at North Dakota State University and eventually played for the Philadelphia Eagles, where he led the team to victory in the Super Bowl LII.