1. Idaho officially became a state. On September 16, 1890, President Benjamin Harrison signed a proclamation recognizing Idaho as the 43rd state in the United States of America.

2. The State of Idaho Seal was unveiled. On September 16, 1863, the Idaho Territorial Legislature chose to adopt a seal for the territory. The seal was a small diamond-shaped seal, in the center of which was an image of a miner at work, surrounded by the words “Great Seal of the Territory of Idaho” and “1863.”

3. The Treaty of September 16, 1868 was signed. Also known as the Treaty of Fort Bridger, this treaty established the Fort Hall Indian Reservation, which is located in southeastern Idaho. The treaty was signed by leaders of the Shoshone-Bannock and the United States.

4. The last stagecoach robbery in Idaho occurred. On September 16, 1916, the last stagecoach robbery in Idaho took place near Salmon. The robbers made off with roughly $5,000 in gold dust and coins.

5. Boise State University was founded. On September 16, 1932, Boise Junior College was founded in Boise, Idaho. The inaugural class had just 70 students, but the college has since grown and expanded to become Boise State University.