1. Statehood: March 18, 1889, marks an important milestone, as North Dakota became the 39th state to join the Union.

2. Great Flood of 1965: On March 18, 1965, the Red River swelled to its highest level, leading to the Great Flood of 1965. This natural disaster affected areas of North Dakota and Minnesota, causing extensive damage to buildings, bridges, and farmland.

3. First woman elected governor: On March 18, 1984, North Dakota elected its first woman governor, George Sinner. She served two terms, from 1985 to 1992.

4. Bison as state mammal: On March 18, 1975, North Dakota declared the American bison as the official state mammal. The bison, which is also known as the buffalo, played a crucial role in the state's history and continues to be an important part of its culture.

5. Red River cart: The Red River cart, a significant part of North Dakota's history, was invented by Métis settlers in the late 18th century. The cart was used for transportation and trade for many years, and March 18 marks Métis Flag Day, which celebrates Métis culture and contributions to the province.