1. In 1890, Idaho was admitted as the 43rd state of the United States on September 10th. This was a significant milestone in Idaho's history and marked the end of its territorial status.

2. On September 10, 1910, a massive wildfire, known as the Big Burn, swept across several states, including Idaho. The wildfire was sparked by a combination of lightning strikes and human activity and destroyed over three million acres of land.

3. In 1930, the Idaho State Capitol building was destroyed by a fire on September 10th. The cause of the fire was never determined, but it is believed to have started in the basement. The building was rebuilt over the next two years and re-opened in 1932.

4. On September 10, 1957, the first atomic-powered electrical generator began operation at the National Reactor Testing Station in Idaho. This marked a major milestone in the development of nuclear energy and led to the construction of several other nuclear power plants in the state.

5. In 1985, Idaho's Sawtooth National Forest was designated as a wilderness area by Congress on September 10th. This protected over 217,000 acres of forest and rivers, preserving it as a natural habitat for wildlife and providing recreational opportunities for visitors.