1. The Battle of Hampden: On December 22, 1814, during the War of 1812, British troops invaded Hampden, Maine. A group of American soldiers and civilians, including women and children, fought back against the British invasion. Although they were vastly outnumbered, they managed to hold off the British for several hours before they were ultimately forced to retreat.

2. Maine becomes a state: On December 22, 1820, Maine officially became the 23rd state in the United States. The state was formed as a result of the Missouri Compromise, which allowed Maine to enter the Union as a free state while Missouri was admitted as a slave state.

3. Record snowfall: On December 22, 1961, Maine experienced record-breaking snowfall, with some areas receiving over 30 inches of snow in a single day. The snowfall caused widespread power outages and transportation disruptions, and many schools and businesses were forced to shut down.

4. First female governor: On December 22, 1994, Maine Governor John McKernan resigned from office, and was succeeded by his Lieutenant Governor, Susan Collins. Collins became the first female governor in Maine history, and went on to serve as a United States Senator from Maine from 1997 to 2021.

5. Lobster industry celebrates: December 22 is National Maine Lobster Day, a day dedicated to celebrating Maine's famous lobster industry. Lobster is an important part of Maine's economy and cultural heritage, and the state is famous for its delicious lobster dishes, from lobster rolls to traditional New England clam bakes.