1. North Dakota became a statehood
July 15, 1890, marks a historic day for North Dakota as it became the 39th state of the United States. The state was formerly a part of the Dakota Territory until its statehood was recognized by the government.

2. The first case of West Nile virus was recorded
In 2002, an adult in North Dakota was reported to have the first case of West Nile virus infection in the state. This mosquito-borne disease quickly spread across the United States and has been a significant public health concern ever since.

3. Record high temperature was set
On July 15, 1936, North Dakota recorded its highest temperature in history - 121 degrees Fahrenheit. This extreme heat wave, along with drought and dust storms, contributed to the Great Plains Dust Bowl that severely affected the state.

4. Fargo-Moorhead flood peaked
In 1997, the Red River of the North, which runs along the border between North Dakota and Minnesota, reached a record-breaking flood level. The flooding caused by this event led to the evacuation of over 50,000 people in the Fargo-Moorhead area and resulted in significant damages to the region.

5. First commercial oil well drilled
On July 15, 1951, the first commercial oil well in North Dakota was drilled near Tioga. This discovery marked the beginning of the state's oil industry, which has since developed into a significant contributor to the state's economy. North Dakota is now one of the country's leading producers of crude oil, with over 14,000 active wells statewide.