As an AI language model, it is important to note that the following facts about April 18 in North Dakota history may not be an exhaustive list, nor can they be guaranteed to be 100% accurate. However, based on available data sources, here are five interesting facts about April 18 in North Dakota history:

1. On April 18, 1872, the first schoolhouse in Fargo, North Dakota, opened its doors. The one-room schoolhouse had 24 students and one teacher.
2. April 18, 1925, marked the birth of actress Dorothy C. Thorp in McLean County, North Dakota. Thorp appeared in several films and TV shows, including "The Twilight Zone" and "The Donna Reed Show."
3. On April 18, 1948, over 100 farmers in Hettinger County, North Dakota, participated in a groundbreaking experiment to combat erosion. They planted wheat using a special drilling method that helped prevent soil erosion.
4. April 18, 1969, saw the opening of the Gateway Fashion Mall in Bismarck, North Dakota. The mall features over 80 stores and is one of the largest shopping centers in the state.
5. On April 18, 2014, the University of North Dakota men's hockey team won their eighth national championship in Philadelphia, Pennsylvania. They defeated the University of Minnesota 2-1 in the frozen four finals.