1. On May 13, 1607, the first permanent English settlement in North America was established in present-day Maine. Led by George Popham and Raleigh Gilbert, the colony was located at the mouth of the Kennebec River and named Fort St. George.

2. May 13, 1783, marked the end of the Revolutionary War for Maine, then a part of Massachusetts. General George Washington announced the end of hostilities with a proclamation at Newburgh, New York, and Maine celebrated its independence from British rule.

3. On May 13, 1862, the USS Kennebec, a Union gunboat, was commissioned in Bath, Maine. The ship served in several famous campaigns during the Civil War, including the siege of Port Hudson and the Mobile Bay campaign.

4. May 13, 1917, saw the founding of the Pine Tree State Arboretum in Augusta, Maine. The arboretum was established to promote the conservation of Maine's native plant species and to provide educational opportunities for residents and visitors.

5. On May 13, 1923, the first aerial forest fire lookout station in the United States was established on Mt. Everett in western Maine. The station was equipped with a telephone and a primitive radio, and served as a model for forest fire prevention and detection nationwide.