1. The state of Maine was officially proclaimed in 1820, but the first European settlement in the region dates back to 1604. On March 6, 1820, the Maine State Constitution became effective, formally establishing Maine as a state within the United States.

2. On March 6, 1962, the largest recorded earthquake in Maine's history occurred. The earthquake measured 5.1 magnitude on the Richter scale and its epicenter was located near the town of Eastport. The quake caused considerable damage to homes and businesses in the area.

3. In 1889, the United States Navy commissioned the USS Maine, a battleship named after the state of Maine. On February 15, 1898, the USS Maine was mysteriously destroyed while anchored in Havana Harbor, leading to the outbreak of the Spanish-American War. Although the cause of the explosion remains uncertain, the suffering of the sailors and Maine's loss was deeply felt in the state.

4. On March 6, 1941, the Maine State Arboretum was established by the Maine Legislature, creating a living museum of trees and plants that showcases Maine's native flora and provides educational opportunities for students and visitors. Dedicated to research, conservation, and education, the Arboretum seeks to promote the sustainable use of the state's natural resources.

5. On March 6, 2019, Maine began its transition to ranked-choice voting for presidential and congressional elections. The system allows voters to rank candidates in order of preference, avoiding the problem of "spoiler candidates" and encouraging more substantive debate. The move was applauded by supporters of electoral reform and is now a part of the state's electoral process.