1. On June 2, 1883, the Baltimore and Ohio Railroad completed a new terminal station in Baltimore, which would become an important hub for transportation in the Mid-Atlantic region.

2. The National Aquarium in Baltimore opened on June 2, 1981. The aquarium has since become a popular tourist attraction, hosting over 1.3 million visitors annually.

3. The state of Maryland ratified the 19th Amendment on June 2, 1919, giving women the right to vote. Maryland was the 27th state to ratify the amendment, which was officially adopted into the U.S. Constitution on August 26, 1920.

4. On June 2, 1992, voters in Maryland approved a constitutional amendment to allow casino gambling, paving the way for the state's first casino to open in 2010.

5. Maryland governor Martin O'Malley signed legislation legalizing same-sex marriage on June 2, 2012, making Maryland the 8th state in the U.S. to legalize same-sex marriage.