1. In 1820, Maine became the 23rd state in the US. This was after separating from Massachusetts as part of the Missouri Compromise. The compromise allowed Maine, which was a free state, to join the Union, while Missouri, which was a slave state, also joined.

2. In 1862, the Battle of Beaver Dam Creek took place during the American Civil War. The battle was part of the Seven Days Battles and saw the Union army, commanded by General Fitz John Porter, being defeated by General Robert E. Lee's confederate army.

3. In 1919, Frank H. Fernald became the Governor of Maine. He was the first Republican governor to serve more than one term in the state, and he also helped bring about significant changes including establishing the state budget system, and modernizing the state's banking system.

4. In 1967, Vice President Hubert H. Humphrey visited Maine and gave a speech at Bowdoin College. He spoke about the importance of education and the need for the US to invest in science and technology. His visit also marked the first time a sitting vice president had visited the state in nearly a decade.

5. In 2015, same-sex marriage became legal in Maine after being approved by voters in a referendum. The state had previously allowed civil unions but had rejected same-sex marriage in a previous referendum in 2009. Maine was the ninth US state to legalize same-sex marriage.