1. January 1, 1863 - Maryland's Emancipation Proclamation
On January 1, 1863, Maryland passed an important law. The Emancipation Proclamation, ending slavery, went into effect in the state of Maryland after being signed by President Abraham Lincoln.

2. January 1, 1887 - Maryland's First Electric Streetcars
On January 1, 1887, the first electric streetcars of Maryland began operation. These streetcars replaced the less efficient horse-drawn carts.

3. January 1, 1947 - First Televised Football Game in Maryland
On January 1, 1947, the first televised football game in Maryland was played between the University of Maryland and the University of Tennessee. This historic match was broadcasted by the American Broadcasting Company (ABC).

4. January 1, 1951 - Maryland's First Female Governor
On January 1, 1951, conservative Republican politician Theodore McKeldin was inaugurated as Maryland's Governor. This marked the first time a female governor had been elected in the state, and was a milestone for women's rights.

5. January 1, 1984 - Maryland Honors Martin Luther King Jr.
January 1, 1984, marked the first Martin Luther King Jr. Day observed in Maryland as a state holiday. This day was established to honor the famous civil rights leader and his contributions to American history.