1. In 1783, Maryland became the seventh state to ratify the Treaty of Paris, officially ending the American Revolutionary War.

2. On January 9, 1825, the Maryland Institute for the Promotion of the Mechanic Arts was founded. The institute aimed to promote industrial and mechanical arts by offering educational programs and sponsoring exhibitions.

3. In 1865, the Maryland General Assembly voted to abolish slavery in the state. The decision came after the ratification of the 13th Amendment to the US Constitution.

4. On January 9, 1939, Maryland Senator George L. P. Radcliffe introduced the first bill proposing the construction of a bridge across the Chesapeake Bay. The bill was not successful, but it paved the way for future efforts to build the Chesapeake Bay Bridge.

5. In 2007, Maryland Governor Martin O'Malley signed the Clean Cars Act into law, making Maryland the first state in the US to adopt California's strict emissions standards for cars and trucks. The law aimed to reduce air pollution and combat climate change.