1. In 1864, Union General George Armstrong Custer led a surprise attack on Confederate forces in Virginia during the Civil War. Custer was born and raised in Idaho, and this victory helped establish his reputation as a talented military leader.

2. Idaho was admitted to the Union as the 43rd state on July 3, 1890. However, April 20 is recognized as "Idaho Day" to commemorate the signing of the Idaho Territory organic act by President Abraham Lincoln in 1863.

3. In 1914, the town of Sandpoint, Idaho was devastated by a major fire that burned over 50 city blocks and left thousands homeless. Despite the destruction, the community rallied together to rebuild and today Sandpoint is a thriving tourist destination.

4. On April 20, 1971, the first Earth Day was celebrated across the United States, including in Idaho. Boise State University hosted events and rallies to raise awareness about environmental issues.

5. In 1999, the Idaho bat population was hit hard by an outbreak of white-nose syndrome, a deadly disease caused by a fungus that grows on bats while they hibernate. This devastating epidemic has spread throughout North America and continues to impact bat populations today.