1. Idaho officially became a state on June 21, 1890. After months of political wrangling, Idaho was finally granted statehood by President Benjamin Harrison, becoming the 43rd state to join the Union.

2. On June 21, 1938, a massive forest fire broke out in the Black Hills region of Idaho, burning over 43,000 acres of timber and forcing the evacuation of several towns in the area. The fire burned for weeks before it was finally brought under control.

3. The Idaho State Capitol building was officially dedicated on June 21, 1920. The Capitol had been under construction for over eight years, and the dedication ceremony was attended by thousands of people from across the state.

4. On June 21, 1992, a massive earthquake struck the Yellowstone region of Idaho, causing widespread damage and causing several deaths. The quake, which measured 7.3 on the Richter scale, was one of the largest ever recorded in the area.

5. Idaho's famous Sun Valley resort opened to the public on June 21, 1936. The resort, which is located in the town of Ketchum, quickly became a popular destination for skiers and outdoor enthusiasts from all over the world. Today, Sun Valley remains one of the most popular ski resorts in the United States.