The correct response is:
The Union victory gave Lincoln the strength and support needed for the issuance of the proclamation.
The Battle of Antietam, fought on September 17, 1862, was a significant turning point in the Civil War, as it provided a key strategic victory for the Union. Following this battle, President Abraham Lincoln felt he had the political capital to issue the Emancipation Proclamation, which declared the freedom of slaves in the Confederate states.