1. Maine officially became the 23rd state of the United States on October 3, 1820. After years of being part of Massachusetts, Maine separated to become its own state as part of the Missouri Compromise.

2. On October 3, 1863, President Abraham Lincoln declared a national day of Thanksgiving to be celebrated on the fourth Thursday of November. This became a crucial part of American culture and tradition, and remains a beloved holiday to this day.

3. The famous Maine Coon cat breed was first recognized on October 3, 1861, at a cat show in New York City. These large, furry cats are known for their friendly personalities, distinctive ear tufts, and long tails, and remain a popular breed today.

4. The Penobscot River Bridge in Maine was completed on October 3, 1940. At the time, it was the longest suspension bridge in the world. Today, it remains an impressive landmark in the state and an important transportation connection.

5. On October 3, 1981, Maine hosted its first ever marathon, the Pine Tree Marathon. The race started and ended in Portland, and went through several towns along the coast of Maine. Today, Maine is known for its beautiful scenic marathons that attract runners from all over the world.