1. On June 8, 1904, the Portland Seadogs played their first baseball game in Portland, Maine. The Seadogs are a minor league affiliate of the Boston Red Sox.

2. In 1949, the first commercial jet airline service in Maine began on June 8. Northeast Airlines made its inaugural flight from Portland to New York City.

3. On June 8, 1970, the Maine Turnpike was officially opened to the public. The toll road runs from Kittery to Augusta and is a major highway in the state.

4. The first official United States postage stamp to depict a lighthouse was issued on June 8, 1990. The stamp featured Maine's Portland Head Light.

5. In 2012, Maine became the first state to pass a law allowing same-sex marriage through a popular vote. The law was signed by the governor on June 8 of that year.