1. 1790 - The first Catholic church in Baltimore, St. Peter's Church, is dedicated by Archbishop John Carroll, making it the first Roman Catholic cathedral in the United States.

2. 1861 - During the American Civil War, the Sixth Massachusetts Regiment clashes with a pro-Confederate mob in Baltimore. The clash becomes known as the Baltimore Riot, and it is one of the worst civil disturbances in American history.

3. 1937 - The Maryland State Police is established, becoming the first state police force in the United States.

4. 1961 - Alan Shepard, a native of East Derry, New Hampshire, becomes the first American in space when his Mercury-Redstone 3 spacecraft, named Freedom 7, makes a suborbital flight from Cape Canaveral, Florida.

5. 2015 - The death of Freddie Gray, a 25-year-old African American man, from Baltimore, Maryland, in police custody, sparks widespread protests and riots throughout the city. Six police officers involved in his arrest are later charged with various crimes, with some being acquitted and others being convicted.