1. On May 28, 1959, Montana became the first state to offer free natural gas service to its residents. The program was initiated to provide low-income families with affordable heating options.

2. In 1934, a magnitude 7.6 earthquake struck near Helena, Montana, causing widespread damage to buildings and infrastructure. The quake was the largest ever recorded in the state and resulted in the deaths of two people.

3. Montana's first governor, Sidney Edgerton, was sworn in on May 28, 1866. The former judge and congressman played a key role in the early development of the state and helped establish its legal system and infrastructure.

4. On May 28, 1983, the Butte Creek Mill, a historic flour mill in Eagle Point, Oregon, was transported to Montana for restoration. The mill was originally built in 1872 and is one of the few surviving water-powered mills in the Pacific Northwest.

5. In 1917, a group of 168 Montana soldiers became the first American troops to arrive in France during World War I. The soldiers, who were part of the 350th Infantry Regiment, were sent to help bolster the French army's defenses against the German military.