Conversation so far:
which side was maryland on in the civil war
During the months leading up to the Civil War, Maryland stood as a house divided. Although it was a slaveholding state, Maryland did not secede.
when was the first blood of the american civil war shed
On April 19, 1861, a secessionist mob in Baltimore attacks Massachusetts troops bound for Washington, D.C. Four soldiers and 12 rioters were killed.
when was the preliminary emancipation proclamation issued
On September 22, 1862, President Abraham Lincoln issued a preliminary Emancipation Proclamation
when did president lincoln's emancipation proclamation take effect
The Emancipation Proclamation took effect January 1st, 1863

Question: what did the president do
Self-contained rewrite: what did president lincoln do to ensure the abolition of slavery