1. On October 5th, 1959, Montana became the 41st state to have a polling station for the National Cancer Institute's study called the "Cancer Chemotherapy National Service Center". This service center helped pave the way for future cancer research and treatments.

2. In 2016, October 5th marked the 125th anniversary of the Great Falls Leader, a Montana newspaper that began publication in 1891. Its early editorials and news reports helped inform and influence residents of the state during a pivotal time in its history.

3. On October 5th, 1990, the town of Fort Benton celebrated its 150th anniversary with a parade, reenactments, and historical tours. This town played a key role in the early days of Montana's history as a fur trading center and transportation hub.

4. October 5th, 1937, was the date that the Montana State Capitol building was officially dedicated. The building's impressive neoclassical design and art works have made it a popular tourist attraction and a symbol of Montana's political history.

5. On October 5th, 1965, President Lyndon B. Johnson visited Montana to address a gathering of the National Farmers Union in Great Falls. Johnson's Great Society initiatives, which aimed to reduce poverty and improve living conditions for all Americans, were emphasized in his speech.