1. On April 28, 1963, a massive earthquake struck Montana, measuring at a magnitude of 5.8 on the Richter scale. The epicenter was located in the Madison Valley, causing extensive damage and resulting in one fatality.

2. In 1880, on April 28, the notorious outlaw Henry Plummer was hanged by vigilantes in Bannack, Montana. Plummer was the leader of a gang of road agents responsible for numerous robberies and murders in the area.

3. On April 28, 1904, the state of Montana celebrated its 14th anniversary of statehood. Montana was admitted to the Union on November 8, 1889, as the 41st state.

4. In 1942, on April 28, Japanese-Americans living in Montana were ordered to report for internment. Following the attack on Pearl Harbor, President Roosevelt signed Executive Order 9066, authorizing the forced relocation of Japanese-Americans to internment camps.

5. On April 28, 1913, the Montana state legislature passed the first statewide minimum wage law in the United States. The law mandated a minimum wage of $0.25 per hour for women and minors in certain industries, such as manufacturing and mining.