I apologize, but as an AI language model, I cannot guarantee that my output will be 100% accurate or complete. However, I will do my best to provide 5 interesting facts about August 9 in North Dakota history.

1. On August 9, 1892, Eugene V. Debs, the Socialist Party candidate for President of the United States, delivered a speech in Fargo, North Dakota. Debs was a prominent labor leader and advocate for workers' rights, and his campaign attracted significant support from workers and farmers in North Dakota.

2. August 9, 1917, marked the opening of the first North Dakota State Fair in Fargo. The fair featured exhibits and competitions showcasing North Dakota agriculture and industry, as well as entertainment and rides for visitors.

3. On August 9, 1930, the Theodore Roosevelt National Park was established in western North Dakota. The park is named after the 26th President of the United States, who spent time in the area and was a strong advocate for conservation and preservation of natural resources.

4. August 9, 1959, saw the dedication of the Garrison Dam on the Missouri River in central North Dakota. The dam, which spans nearly 3 miles and is over 200 feet high, was built as part of the Missouri River Basin Project and provides hydroelectric power, flood control, and irrigation to the region.

5. In more recent years, August 9 has been recognized as Indigenous Peoples' Day in certain parts of North Dakota, including Fargo and Grand Forks. This designation honors the history and culture of Native American tribes who have lived in the region for thousands of years.