1. Montana became a state: On March 3, 1889, Montana officially became a state, joining the United States as the 41st state. This day is celebrated annually as Montana Statehood Day.

2. The Battle of the Bear Paw: On March 3, 1877, the Battle of the Bear Paw took place in Montana, marking the end of the Nez Perce War. The Nez Perce, led by Chief Joseph, were attempting to flee to Canada but were defeated by U.S. forces.

3. The Anaconda Copper Company: On March 3, 1899, the Anaconda Copper Company was founded in Montana, eventually becoming one of the largest copper producers in the world.

4. The Montana State Capitol building: On March 3, 1902, construction began on the Montana State Capitol building in Helena. The building was completed in 1909 and remains an iconic landmark in the state.

5. The first female governor: On March 3, 1925, Miriam A. Ferguson became the first woman to be elected governor in the state of Montana. She served a single term from 1925 to 1927.