1. On May 30, 1868, the first Memorial Day was observed in Portland, Maine, when the graves of fallen soldiers were decorated with flowers. This was a precursor to the national holiday that would be established in 1971.

2. On May 30, 1927, Charles Lindbergh flew over Maine on his solo transatlantic flight from New York to Paris, becoming the first person to make the journey nonstop. He traveled at an altitude of 10,000 feet and passed over Portland, Maine, before heading out to sea.

3. On May 30, 1958, the first Canadian interprovincial highway opened in Edmundston, New Brunswick, which connected Maine to the rest of Canada. The highway was part of the Trans-Canada Highway system and was one of the most significant engineering feats of its time.

4. On May 30, 1996, a fierce windstorm swept through Maine, knocking down over 1 million trees and leaving 600,000 people without power. The storm caused over $1 billion in damage and was one of the most devastating natural disasters in Maine's history.

5. On May 30, 2012, Maine became the first state in the country to allow same-sex marriage through a popular vote. The referendum passed with a majority of 53%, and same-sex couples were able to legally marry in Maine starting in December of that year.