1. In 1867, the first stagecoach arrived in Helena, Montana, which was a major transportation breakthrough for the state. The stagecoach provided a safe and reliable mode of transport for passengers and mail.

2. On March 18, 1909, Montana ratified the 16th Amendment to the US Constitution, which allowed Congress to enact an income tax. This was a significant event in Montana's history as it helped fund government programs and infrastructure projects.

3. In 1925, a devastating tornado struck the town of Huntley, Montana, killing four people and causing extensive damage. March 18 is a date that has been etched in the memories of residents who lived through the disaster.

4. In 1977, Montana resident and Vietnam War veteran Jay Hess was awarded the Congressional Medal of Honor for his bravery in combat. Hess repeatedly put his life on the line to save his fellow soldiers and is considered a hero in Montana.

5. On March 18, 1985, Montana governor Ted Schwinden signed the state's first hate crime law, which made it illegal to commit a crime based on an individual's race, religion, or sexual orientation. This was a major step towards promoting tolerance and equality in Montana.