1. In 1865, the Idaho Territory was established by an act of Congress. Idaho was initially part of the Oregon Territory until it became a separate territory from Washington in March of 1863. The Territory was named after the Native American word "Idaho," which means "gem of the mountains."

2. In 1900, Idaho's first suspension bridge was built across the Snake River between Asotin, Washington, and Lewiston, Idaho. The bridge was called the Lewiston-Clarkston Bridge and was the only road connection between the two towns until 1931 when a new bridge was built.

3. In 1915, the Idaho State Capitol building was completed in Boise. The building was designed by architect John E. Tourtellotte and his partner Charles Hummel. The Capitol is built in the Renaissance Revival style and features a large dome that is similar to the one on the United States Capitol.

4. In 1930, the first census of the Idaho population was conducted. The census counted 445,032 people living in Idaho, which was an increase of 31% since the previous census in 1920. This growth in population was due in part to the expansion of mining and agriculture in the state.

5. In 1965, President Lyndon B. Johnson signed the Wilderness Act, which established the Selway-Bitterroot Wilderness in Idaho. The wilderness area covers over 1.3 million acres and is home to a variety of wildlife, including grizzly bears, wolves, and elk. The area is popular for hiking, camping, and fishing.