1. In 1806, the Lewis and Clark Expedition passed through what is now Montana on July 25th. They reached the mouth of the Yellowstone River, where they encountered a large group of Native Americans who were fishing.

2. On July 25, 1867, Montana became a territory of the United States. This was a significant moment in Montana's history, as it paved the way for statehood nearly 30 years later.

3. In 1893, on July 25th, the first train arrived in Helena, Montana. This was a momentous occasion for the city, which until then had only been accessible by steamboat or stagecoach.

4. On July 25th, 1910, a massive wildfire known as the "Big Blowup" swept through Montana and Idaho. The fire, which was caused by lightning strikes, burned over 3 million acres and remains one of the worst wildfires in U.S. history.

5. On July 25th, 1956, the Anaconda Copper Mining Company announced plans to shut down its mining operations in Butte, Montana. This marked the beginning of a decline in the state's mining industry, which had been a major economic driver for much of Montana's history.