1. On November 21, 1902, the last spike of the Butte, Anaconda, and Pacific Railway was driven in Anaconda, Montana. The railway was the longest electric interurban rail line in the world at the time and served several mining communities in southwest Montana.

2. In 1942, on November 21st, the Anaconda Copper Mining Company strike began in Butte, Montana. The strike lasted for over two years and resulted in violent conflicts between miners and company officials.

3. November 21, 1953, marked the opening of the University of Montana's Skaggs Building, which houses the College of Pharmacy. The building was named after Albert Skaggs, a Montana pharmacist who made significant contributions to the pharmacy profession.

4. On November 21, 1978, the Montana State Capitol building was added to the National Register of Historic Places. The building, located in Helena, was completed in 1902 and is known for its copper dome and classical architecture.

5. In 2001, on November 21st, Yellowstone National Park officials announced that they would begin phasing out snowmobiles in the park. The decision was controversial, as snowmobiles had been a popular mode of transportation and recreation in the park for decades.