1. On April 22, 1889, the Dakota Territory was officially divided into the states of North Dakota and South Dakota.

2. On April 22, 1930, the first oil well was completed in the Williston Basin in North Dakota, marking the beginning of the state's oil boom.

3. On April 22, 1935, a powerful tornado hit the city of Aneta in North Dakota, killing 17 people and destroying much of the town.

4. On April 22, 1966, a fire broke out at the Minot Air Force Base in North Dakota, destroying 10 nuclear-armed B-52 bombers and spreading radioactive debris across the surrounding countryside.

5. On April 22, 1970, the first Earth Day was held, with events and activities taking place across North Dakota and the rest of the United States to raise awareness about environmental issues.