1. On December 18, 1908, the first airplane flight in the state of Maine took place in Augusta. Pilot Albert B. King flew a plane designed by the Wright brothers and performed aerial acrobatics over the state capital.

2. In 1974, the Maine legislature passed the Maine Indian Claims Settlement Act on December 18, which recognized the sovereignty of the Penobscot and Passamaquoddy tribes and provided them with financial compensation and land in compensation for past injustices.

3. On December 18, 1862, Confederate troops under General John B. Hood conducted a raid on the town of Calais, Maine. The Union soldiers stationed there were able to repel the attack, and this remains one of the few instances of Confederate forces invading the state.

4. In 1909, the Maine State House of Representatives voted to approve a law prohibiting the sale of alcohol on Sundays, which became known as the "blue law" or "Sunday law." This law remained in effect until 2015, when it was finally repealed after years of controversy.

5. December 18, 1776, marked the first known military action on the Maine coast during the American Revolution, as a British ship fired upon an American vessel off the coast of what is now South Portland. This skirmish represents one of the early battles of the war and underscores Maine's important maritime role.