August 21 has significant historical events in Montana that shaped the state into what it is today. Here are 5 interesting facts about August 21 in Montana history:

1. On August 21, 1862, gold was discovered near Helena, Montana. This discovery led to a gold rush, and over 10,000 prospectors rushed to the area in search of wealth. The discovery of gold played a significant role in Montana's economy and development.

2. In 1883, on this day, the Northern Pacific Railroad laid its final rail depots connecting the East Coast to the West Coast. The railroad opened up the territory and allowed for quicker transportation of goods which helped fuel the development and growth of Montana.

3. Montana became the 41st state on August 21, 1889. Montana was admitted to the United States as the 41st state after years of being a territory. This event marked the end of a long journey for Montanans in their push for statehood.

4. On August 21, 1942, the Montana State Prison riot occurred, leading to one of the deadliest prison riots in US history. The riot was sparked by overcrowding and poor living conditions at the prison. The day-long riot resulted in the deaths of three guards and an inmate.

5. In 2017, on August 21, Montana witnessed a partial solar eclipse, where the moon passed between the sun and the earth, casting a shadow on the earth. Millions of people across the United States, including those in Montana, gathered to witness the rare event.

Overall, August 21 has played a significant role in shaping Montana's history, with events ranging from the discovery of gold to the state's admission into the union, to more tragic moments such as the prison riot. Nevertheless, each event serves as a reminder of Montana's complex past and its journey towards progress and development.