1. In 1890, the Idaho Statehood Bill was signed into law by President Benjamin Harrison, officially making Idaho the 43rd state in the United States.

2. In 1933, the historic Sun Valley Ski Resort opened in central Idaho, becoming the first ski resort in the United States.

3. In 1942, the Japanese submarine I-25 launched a seaplane that bombed a forest near Brookings on the Oregon coast. This was the first time the United States mainland had been bombed since the American Civil War, and the event heightened fears of a Japanese invasion on the West Coast during World War II.

4. In 1984, The College of Idaho in Caldwell became the first college or university in the United States to host a conference on computer ethics, exploring the ethical considerations of developing and using computer technology.

5. In 2000, wildfires raged across Idaho, burning over 400,000 acres of land and causing over $33 million in damage. The fires were exacerbated by unusually dry weather and high winds, and were some of the worst natural disasters in Idaho history.