1. On September 5, 1774, the Connecticut Colony sent its first delegate, Eliphalet Dyer, to the Continental Congress in Philadelphia. Dyer played a key role in drafting the Articles of Confederation and later served as a U.S. Senator.

2. On September 5, 1855, the Mystic River Bascule Bridge in Groton opened to traffic. The bridge, which is still in use today, was designed to allow boats to pass over the river and features a unique counterweight system.

3. On September 5, 1929, the Warner Theater opened in Torrington. The theater, which is now listed on the National Register of Historic Places, has hosted numerous famous performers over the years including Ella Fitzgerald, Duke Ellington, and Frank Sinatra.

4. On September 5, 1969, a major explosion occurred at the Middletown Power Station, killing one worker and injuring several others. The accident was caused by a natural gas leak and led to reforms in safety protocols for power plants.

5. On September 5, 2010, the Connecticut Sun basketball team set a franchise record with their 23rd win of the season. Led by All-Star forward Tina Charles, the Sun went on to reach the WNBA Finals that year, but ultimately fell to the Seattle Storm.