1. On November 3, 1906, Montana held its first ever state election under the newly formed state constitution. This marked a significant moment in Montana history as it transitioned from a territory to a state.

2. In 1936, on November 3, the Anaconda Copper Mining Company was found guilty of illegally profiting from the New Deal's National Recovery Act. The company was fined $250,000, marking a significant moment in the history of mining regulation in Montana.

3. On November 3, 1967, the Supreme Court of Montana ruled that the state's law prohibiting interracial marriages was unconstitutional. This ruling helped pave the way for civil rights and equality in Montana.

4. In 1998, on November 3, Montana voters passed Initiative 137, which banned the use of certain types of traps for hunting and trapping animals. This was a significant moment for animal welfare in Montana and marked a shift towards more ethical hunting practices.

5. Finally, on November 3, 2015, Montana became the fourth state in the USA to legalize same-sex marriage. This marked a major moment for the LGBTQ+ community in Montana and helped pave the way for greater acceptance and equality across the country.