1. Idaho became a territory of the United States on April 10, 1863, when President Abraham Lincoln signed the Idaho Organic Act. Prior to this, the land was part of the Oregon Territory.

2. On April 10, 1912, the Idaho State Capitol building was dedicated. The building, located in Boise, is notable for its distinctive dome and use of locally quarried stone in its construction.

3. In 1978, Bob Taft became the first African-American speaker of the Idaho House of Representatives on April 10. Taft, a Republican from Boise, served in the state legislature for 22 years.

4. April 10, 2007, saw the groundbreaking for the Idaho Center for Autism and Related Disorders at the University of Idaho's Boise campus. The center, which is a research and treatment facility, opened in 2009.

5. Idaho's famous Spud Day celebrations, which honor the potato farming heritage of the town of Shelley, often take place on the second Saturday in September. However, in 2010, the event was moved to April 10 to commemorate the 100th anniversary of the town's incorporation.