1. On June 9, 1730, the Maryland Assembly passed an act to establish a ferry across the Susquehanna River. This ferry played an important role in connecting the eastern and western parts of Maryland, as well as facilitating trade and commerce.

2. June 9, 1854 marked the date when the Maryland Agricultural College (later renamed the University of Maryland) was established by an act of the Maryland General Assembly. The college was originally located in Prince George's County, but was later moved to its current location in College Park.

3. On June 9, 1863, Confederate troops under the command of General Stuart raided the town of Westminster, Maryland. This raid caused significant damage to the town and was part of the larger Gettysburg campaign.

4. In 1958, the Chesapeake Bay Bridge (known as the William Preston Lane Jr. Memorial Bridge) opened to traffic on June 9. The bridge spans the Chesapeake Bay, connecting Kent Island to the eastern shore of Maryland.

5. On June 9, 1994, Maryland governor William Donald Schaefer signed legislation making English the official language of the state of Maryland. This law made Maryland one of a handful of states to have an official language, and was seen as controversial by some.