1. Maine was officially admitted as the 23rd state in the United States on April 11, 1820. Prior to its statehood, Maine had been a territory of Massachusetts.

2. On April 11, 1862, the Battle of Fort Pulaski took place in Georgia during the Civil War. Although not directly related to Maine, the battle marked a significant point in the Union's strategy to blockade Confederate ports.

3. In 1898, the USS Maine, a battleship commissioned by the United States navy, was raised from Havana Harbor in Cuba where it had reportedly sunk due to an explosion. This event is often cited as a major factor that led to the Spanish-American War.

4. April 11, 1914 marked the opening of the Panama Canal, a monumental engineering feat that connected the Atlantic and Pacific Oceans. While not directly related to Maine, the canal helped reduce shipping times and costs for goods traveling to and from the state.

5. In 1945, Maine Senator Margaret Chase Smith became the first woman to serve in both houses of Congress when she was sworn into the Senate. Senator Smith is also known for her famous "Declaration of Conscience" speech, in which she criticized the tactics of Senator Joseph McCarthy during the era of McCarthyism.