1. On April 5, 1775, the town of Lexington, Massachusetts, became a flashpoint in the American Revolutionary War when British soldiers marched on the town in search of firearms and ammunition. The clash between the British troops and the colonial militia that followed became known as the Battle of Lexington, and it marked the first military engagement of the American Revolution.

2. In 1951, on April 5th, Julius and Ethel Rosenberg, two American citizens accused of espionage on behalf of the Soviet Union, were sentenced to death by a federal court judge in New York. The Rosenbergs were the only Americans ever executed during peacetime for espionage-related crimes.

3. April 5, 1968, marked a tragic day in the history of Springfield, Massachusetts when a major fire broke out in the city's downtown area, destroying several buildings and killing 16 people. The fire, which began in a department store, was one of the deadliest in Massachusetts history and had a significant impact on the city's landscape and economy.

4. April 5, 1993, saw the opening of the John F. Kennedy Presidential Library and Museum in Boston, Massachusetts. The museum, which is located on the campus of the University of Massachusetts Boston, houses more than 35 million pages of official and personal documents, as well as photographs, film, and audio recordings from the Kennedy administration.

5. On April 5, 2018, Massachusetts Governor Charlie Baker signed a comprehensive criminal justice reform bill into law, overhauling various aspects of the state's criminal justice system. The legislation included provisions for reducing mandatory minimum sentences, expanding diversion programs for young people, and improving conditions for pretrial detainees, among other changes.