1. Idaho becomes the 43rd state - On June 1, 1890, Idaho became the 43rd state in the United States. After years of controversy surrounding statehood efforts, President Benjamin Harrison signed the Idaho Admission Act and the territory officially became a state.

2. The Great Fire of 1910 - On June 1, 1910, the Great Fire of 1910 started in northern Idaho and western Montana. It is believed to be the largest forest fire in US history, burning over 3 million acres and killing nearly 90 people.

3. Idaho's first female governor - On June 1, 2007, Idaho sworn in its first female governor, C.L. "Butch" Otter. Otter took over as governor after former Governor Dirk Kempthorne was appointed US Secretary of the Interior.

4. The creation of Craters of the Moon National Monument - On June 1, 1924, President Calvin Coolidge signed a proclamation creating Craters of the Moon National Monument in southern Idaho. The monument consists of volcanic formations, lava flows, and other unique geological features.

5. Idaho's first railroad - On June 1, 1871, the first railroad in Idaho was completed. The Utah & Northern Railroad, a subsidiary of the Union Pacific, completed a track from Corinne, Utah to the Idaho border at Franklin. The railroad was integral to the development of Idaho's mining industry.