1. In 1891, the town of Ketchum was officially incorporated. Located in central Idaho, Ketchum gained notoriety as the home base of celebrities and affluent skiers in the 20th century. The popular ski resort Sun Valley is located nearby.

2. The Idaho State Capitol building, located in Boise, was completed on April 6, 1920. The building, which features neoclassical architecture and 208-foot-tall dome, cost $2.1 million to construct and has since become a symbol of Idaho's political power and history.

3. On April 6, 1947, a major earthquake struck the region surrounding the town of Challis. The earthquake, which registered 6.5 on the Richter scale, caused significant damage to buildings and infrastructure throughout the area. However, no fatalities were reported thanks to the remote and rural location of the quake.

4. In 1970, Idaho Governor Don Samuelson declared a state of emergency due to a severe flood in the state. The flood, which affected multiple counties and resulted in millions of dollars in damages, was the result of heavy snowfall and subsequent spring melt.

5. On April 6, 1998, a gunman entered a high school in Pocatello and began shooting students and faculty members. Two students were killed in the incident before the assailant was subdued by police. The event shocked the community and spurred discussions on gun control and school safety nationwide.