1. On February 15, 1820, Maine became the 23rd state in the US, separating from Massachusetts. This was a result of the Missouri Compromise, which aimed to maintain a balance of power between free and slave states.

2. In 1884, Harvard University celebrated its 250th anniversary. The university was founded in 1636 and is the oldest institution of higher education in the US.

3. On February 15, 1965, the iconic Boston Tea Party ship, the USS Constitution, sailed from the Charlestown Navy Yard to mark its 150th anniversary. The ship is now a museum and a popular tourist attraction in Boston.

4. On this day in 1986, the Massachusetts legislature approved a bill to make Martin Luther King Jr.'s birthday a state holiday. The federal holiday had been established in 1983, but it took several years for all states to adopt it.

5. In 2003, the Boston Red Sox announced plans to install a new $10 million scoreboard and video display system at Fenway Park. The iconic stadium, built in 1912, is known for its Green Monster wall in left field and has undergone several renovations throughout its history.