1. In 1870, President Ulysses S. Grant signed a bill creating the Idaho Territory, which included what is now Idaho, Montana and Wyoming. This marked the beginning of formal government in the region and allowed for more organized settlement.

2. In 1934, President Franklin D. Roosevelt signed the Indian Reorganization Act, which allowed Native American tribes in Idaho and throughout the country to form their own governments and take control of their own affairs. This was a significant step towards recognizing the sovereignty and independence of Native American tribes.

3. In 1909, the first railroad bridge across the Snake River was completed near Huntington, Idaho. This allowed for easier transportation of goods and people across the river and helped facilitate the growth of the state's economy.

4. In 1973, the Sawtooth National Recreation Area was established in central Idaho. This area encompasses over 750,000 acres of wilderness, lakes, and mountains and has become a popular destination for outdoor enthusiasts.

5. In 1968, the United States Atomic Energy Commission announced that it had selected Idaho as the site for the world's first breeder reactor. This experimental nuclear reactor was designed to produce more nuclear fuel than it consumed and was seen as a promising solution to the world's energy needs. However, the project was eventually cancelled due to safety concerns and cost overruns.