1. On September 26, 1789, Maryland became the seventh state to ratify the United States Constitution, granting the document the necessary support to establish a new federal government.

2. In 1941, on September 26, the US Navy commissioned the Washington Navy Yard's Photographic Science Laboratory, where researchers developed new imaging technologies during World War II, including improved aerial reconnaissance techniques.

3. On September 26, 1952, the University of Maryland opened the doors of the first nuclear reactor in the state, part of a push to expand research and development capabilities for the US Atomic Energy Commission.

4. On September 26, 1985, the Baltimore Orioles celebrated "Eddie Murray Day" at Memorial Stadium, honoring the star first baseman for his achievements on and off the field.

5. In 2009, the Baltimore City Circuit Court ruled on September 26 that a state law that prevented same-sex couples from marrying violated the Maryland Constitution's guarantees of equal rights and protection under the law. That decision paved the way for the state to become one of the earliest to legalize same-sex marriage.