Baltimore secessionist rioters attack the federal 6th Massachusetts Infantry as it passes through the city to join the defense of Washington. It is the first significant bloodshed and loss of life of the Civil War, as there are fatalities on both sides. A day before, the Black servant of a Pennsylvania officer is hit and injured by a brick.
New President Abraham Lincoln is faced with a hostile city blocking his lifeline from the U.S. Capital to the northern states. He arrests local rebel leaders and soon sends in federal troops to place Baltimore under martial law. The riot becomes a rallying cry that aids recruitment of volunteer troops for both sides.
Maryland passes a new constitution that outlaws slavery 3 months before the 13th Amendment.
Maryland unionists pass a new state constitution in 1864 that outlaws slavery and disenfranchises Confederate sympathizers