1. Idaho Becomes a Territory: On March 25, 1863, President Abraham Lincoln signed the Organic Act, officially establishing the Idaho Territory. This made Idaho one of the oldest territories in America.

2. The Boise River Disaster: On March 25, 1865, Boise saw one of the most significant floods in its history. The flood was caused by an ice dam that had built up on the Boise River. The disaster destroyed homes, livestock, and crops, and the damage was estimated to be in the millions.

3. Idaho's First Female Legislator: March 25, 1899, saw the election of Idaho's first female legislator, Clara Campbell. She served in the Idaho House of Representatives and was a prominent figure in Idaho's suffrage movement.

4. Idaho Joins WWII Efforts: On March 25, 1941, Idaho Governor C.A. Bottolfsen joined governors from 42 other states to sign the Declaration of Unity, pledging their support for the war effort during World War II.

5. Craters of the Moon National Monument Established: In 1924, on March 25th, President Calvin Coolidge declared Craters of the Moon a national monument. The site, located in south-central Idaho, is a surreal landscape filled with volcanic formations, including cinder cones and lava tubes. Today the park draws tourists from around the world.