1. In 1812, the United States declared war on Britain, marking the beginning of the War of 1812. This had significant impacts on Maryland, as the state was a major battleground and was invaded by British forces several times.

2. On July 19, 1976, Barbara Mikulski was elected to the United States Senate from Maryland, becoming the first woman to be elected to this position from the state. She went on to serve five terms as a senator and was a powerful advocate for women's rights and social justice.

3. In 2013, Maryland became the first state to pass a law allowing same-sex marriage through a popular vote. The law was passed on November 6, 2012, and went into effect on January 1, 2013, making history and setting an example for other states.

4. On July 19, 1996, the Hubble Space Telescope captured an iconic image of the Eagle Nebula, sometimes called the "Pillars of Creation." This image has become one of the most famous astronomical images of all time and has contributed to our understanding of the universe.

5. The Chesapeake Bay is an important feature of Maryland's geography and history. On July 19, 2018, the Chesapeake Conservancy announced a new partnership with the National Park Service to expand the Chesapeake Bay Watershed Boundary Layer, a tool that helps protect and restore the health of the Chesapeake Bay ecosystem. This partnership reflects the ongoing efforts to preserve this natural wonder for future generations.