1. On December 21, 1872, the Northern Pacific Railroad completed its tracks across North Dakota, marking a major milestone in the state's transportation history. The railroad played a crucial role in the economic development of North Dakota, facilitating the transport of crops and goods to other parts of the country.

2. December 21, 1890, is a tragic date in North Dakota history. It was on this day that the Wounded Knee Massacre occurred, where 150-300 Lakota Sioux were killed by the U.S. Army. The massacre was one of the last major conflicts between Native Americans and the U.S. government.

3. December 21, 1917, marked the first day of North Dakota's statewide prohibition of alcohol, which was implemented ahead of the national Prohibition era. The ban lasted until the repeal of the 18th Amendment in 1933.

4. On December 21, 1929, the city of Fargo experienced a devastating fire that destroyed much of its downtown area. The fire was caused by an explosion at a local bakery and resulted in $5 million in damages. Despite the destruction, the city was able to rebuild and prosper in the following years.

5. December 21, 2013, was the day that North Dakota State University's football team won its third consecutive FCS National Championship, solidifying its dominance in the division. The Bison have continued to be a powerhouse in college football, winning eight national championships in total.