1. In 1820, Maine became the 23rd state in the United States. After years of being a part of Massachusetts, Maine gained its statehood on February 21 of that year.

2. On February 21, 1865, Union soldiers under the command of General Joshua L. Chamberlain rode into the Confederate capital of Richmond, Virginia. Chamberlain, a native of Maine, would later serve as governor of the state from 1867 to 1871.

3. On February 21, 1902, the Maine Senate passed a bill authorizing the establishment of the Maine Bureau of Industrial and Labor Statistics. This organization was responsible for collecting and analyzing data related to labor and industry in the state.

4. John Bapst, a German-born Jesuit priest, arrived in Bangor, Maine on February 21, 1857. Bapst went on to found the first Catholic church in Bangor, as well as several others in the state, and is credited with helping to establish the Catholic Church in Maine.

5. Kenneth M. Curtis, who served as governor of Maine from 1967 to 1975, was born on February 21, 1931. Curtis was the first Maine governor to have been born in the 20th century and was known for his efforts to modernize the state's government and infrastructure.