Answer:
Secretary of State William Seward.
Union victory.
Battle of Antietam.
Step-by-step explanation:
As America entered into the Civil War, President Abraham Lincoln chose to issue the Emancipation Proclamation. He was advised by Secretary of State William Seward to wait until the Union victory. The proclamation stated all slaves to be freed and henceforward not tied to their master. President Lincoln waited till the Union victory in Antietam to gather support and declared in the South.