1. April 1, 1915: North Dakota adopts the state flag
On April 1, 1915, North Dakota officially adopted its state flag. The flag features a blue field with a bald eagle in the center holding a bundle of arrows and an olive branch. The blue field represents loyalty, justice, and truth, while the eagle symbolizes freedom and strength.

2. April 1, 1920: Cavalier County is established
On April 1, 1920, Cavalier County was established in North Dakota. It is named after Charles Cavileer, a fur trader and founder of the town of Pembina. The county's seat is in the city of Langdon.

3. April 1, 1932: The state's first radio station goes on the air
On April 1, 1932, North Dakota's first radio station, KFYR, went on the air in Bismarck. It was an affiliate of NBC and helped provide news, entertainment, and weather updates to listeners across the state.

4. April 1, 1966: Minot Air Force Base is established
On April 1, 1966, Minot Air Force Base officially became operational in North Dakota. It is home to the 5th Bomb Wing and the 91st Missile Wing, which are responsible for maintaining and operating intercontinental ballistic missile and bomber systems.

5. April 1, 1985: Bismarck State College becomes a four-year institution
On April 1, 1985, Bismarck State College became a four-year college, offering bachelor's degrees in applied science and energy management. Today, the college offers a variety of degree programs and has a strong focus on energy-related fields, reflecting North Dakota's important role in the energy industry.