1. On September 7, 1927, construction began on the iconic Charles River Dam in Boston. It was the largest dam in the world at the time and is still in use today, protecting the city from flooding and providing hydroelectric power.

2. September 7, 1774, marked the day of the first Continental Congress of the American Colonies in Philadelphia. Massachusetts delegates, including John Adams, Samuel Adams, and John Hancock, played a crucial role in setting the course for the American Revolution.

3. In 1953, September 7 was declared "Paul Revere Day" in Massachusetts, marking the 200th anniversary of Revere's midnight ride warning of British invasion. Revere was born and lived most of his life in Boston, making this an important day for Massachusetts history.

4. On September 7, 1975, the Boston Red Sox defeated the Oakland Athletics 7-6 in a thrilling 14-inning game. It was an important victory that helped the team secure their first American League pennant since 1967.

5. September 7, 1943, marked the day that Massachusetts resident Mary Bartron completed her service as a Women's Army Corps (WAC) officer during World War II. Bartron was one of many courageous women who served their country during the war and helped pave the way for greater opportunities for women in the military.