1. On March 25, 1660, the Connecticut General Assembly declared Connecticut's independence from the Massachusetts Bay Colony, marking the beginning of Connecticut's existence as a separate colony.

2. On March 25, 1774, the Connecticut General Assembly passed the Coercive Acts, a set of laws in response to the Boston Tea Party, which were aimed at punishing the people of Massachusetts but affected all of the colonies, raising tensions and fueling the revolutionary movement.

3. On March 25, 1807, the USS Nautilus, the first submarine built by Robert Fulton, successfully performed its first dive in the Thames River in Connecticut, demonstrating the potential of underwater warfare.

4. On March 25, 1911, the Triangle Shirtwaist Factory fire in New York City claimed the lives of 146 garment workers, many of them young immigrant women, including some from Connecticut who worked in the sweatshops of New York.

5. On March 25, 1976, Connecticut became the first state to legalize the use of hypodermic needles by drug addicts for personal use, in an effort to prevent the spread of diseases like HIV and hepatitis among drug users, a controversial but pioneering approach to harm reduction.