1. In 1867, the town of Virginia City was established in Montana on June 18th. Virginia City was a booming town during the gold rush era and became the capital of the Montana Territory in 1865.

2. On June 18th, 1873, the Battle of the Musselshell took place between the Sioux and Northern Pacific surveyors in what is now central Montana. The Sioux attacked the surveying party, killing several members and driving off their horses.

3. In 1904, the Montana State Fairgrounds opened in Great Falls on June 18th. The first state fair was held on this site in September of that same year.

4. On June 18th, 1929, the Glacier Park Lodge in East Glacier Park, Montana, officially opened to the public. The lodge was constructed in just over a year and became a popular destination for tourists visiting Glacier National Park.

5. June 18th, 1945, marked the opening of the B-17 factory in Great Falls, Montana. During World War II, the factory produced over 300 B-17 bombers for the United States military, contributing significantly to the war effort.