1. In 1864, the town of Pembina, located on the border of North Dakota and Canada, was incorporated. Pembina was an important trading and transportation center in the mid-19th century, serving as a stopping point for fur traders and railroad workers.

2. On May 30, 1922, John Burke, the ninth governor of North Dakota, passed away. Burke was a progressive Democrat who implemented a number of reforms during his time in office, including the creation of the state's first income tax and the establishment of a state bank.

3. In 1936, the town of Rugby, North Dakota was hit by a tornado that caused significant damage to the town's business district. Despite the destruction, the town was able to rebuild and continues to thrive today as the "Geographic Center of North America," as it is located near the exact center of the continent.

4. May 30, 1955 was a significant day in North Dakota aviation history, as the first air traffic control tower in the state began operation at the Bismarck Municipal Airport. The tower was built in response to the increased traffic at the airport and was staffed by Federal Aviation Administration personnel.

5. On this day in 1983, the North Dakota State Capitol building in Bismarck was added to the National Register of Historic Places. The Capitol, completed in 1934, is a stunning example of Art Deco architecture and is one of the most recognizable landmarks in the state.