1. In 1865, the Idaho Territory was established by an act of the U.S. Congress, marking the beginning of Idaho's territorial period.

2. On June 19, 1892, a fire swept through the town of Hailey, destroying much of the business district and leaving over 250 people homeless. The fire started in a livery stable and quickly spread due to high winds and dry conditions.

3. In 1910, the Big Burn wildfire engulfed over 3 million acres of forestland in Idaho and Montana, causing widespread destruction and claiming the lives of 78 firefighters. The fire was a turning point in the history of wildfire management in the United States.

4. On June 19, 1939, Idaho's first public swimming pool opened in Boise's Municipal Park, providing a popular recreational space for residents during the hot summer months.

5. In 1986, the Idaho State Capitol Building was added to the National Register of Historic Places. The capitol, which was completed in 1912, is known for its neoclassical architecture and copper dome, and serves as the center of Idaho's government.