1. Idaho Achieves Statehood: On September 1, 1890, Idaho officially achieved statehood, becoming the 43rd state in the United States.

2. First Air Mail Delivery: In 1920, the first airmail delivery in Idaho was made from Boise to Elko, Nevada, on September 1. This historic event marked the beginning of air postal service in the state.

3. Silver City Fire: One of the most destructive fires in Idaho history broke out on September 1, 1881, in the mining town of Silver City. The fire destroyed most of the town and left thousands of residents homeless.

4. Idaho Potato Industry Founded: On September 1, 1937, a group of Idaho potato farmers formed the Idaho Potato Growers Association, which helped to establish the state as a leading producer of potatoes in the United States.

5. Broadway Legend Born: Idaho native, and Broadway legend, Peggy Lee was born on September 1, 1920. Peggy Lee was a renowned singer, songwriter, and actress, known for her hits like "Fever" and "Is That All There Is?" She was also a prolific composer and was nominated for an Academy Award for her song "Johnny Guitar."