1. Maine celebrated its bicentennial on March 15, 2020, marking 200 years since the state's official admission into the United States as the 23rd state.

2. On March 15, 1820, Maine's first governor, William King, was inaugurated in Portland. He served two terms and is considered one of the founding fathers of the state.

3. Mount Katahdin, the highest mountain in Maine and the northern terminus of the Appalachian Trail, was first climbed on March 15, 1804 by surveyor Charles Turner and his team.

4. March 15, 1913 marked the opening of the Abbe Museum in Bar Harbor, which is dedicated to preserving and sharing the history and culture of Maine's indigenous people, the Wabanaki.

5. The Maine State House, located in Augusta, was dedicated on March 15, 1832. It has since undergone several renovations and expansions, including the addition of the iconic copper dome in 1909.