1. The Utah War officially began on September 6, 1857, when over 100 US Army troops under the command of Major John M. Hockaday entered the Salt Lake Valley without permission from the Mormon leaders. The troops were sent by President James Buchanan to establish control over the territory and replace Brigham Young as governor.

2. On September 6, 1898, the first ever intercollegiate football game played in Utah took place between the University of Utah and the Latter-Day Saints College (now Brigham Young University). The game was played at Cummings Field in Salt Lake City and ended in a scoreless tie.

3. The Utah State Fair has been held annually since 1856, with the exception of a few years during wartime. September 6, 1916, marked the opening day of the State Fair that year, which featured attractions such as horse racing, livestock exhibits, and a midway.

4. One of the deadliest military training accidents in US history occurred on September 6, 1955, in the hills above Brigham City. A US Air Force B-25 bomber crashed into the mountain, killing all 10 crew members on board. A memorial honoring the fallen crew was later erected near the crash site.

5. On September 6, 1997, the largest earthquake to hit Utah in 40 years struck the town of Arimo, located near the Idaho border. The 5.7 magnitude quake caused widespread damage to buildings, roads, and bridges in the area, but no deaths or serious injuries were reported.