The Battle of Antietam (1862), the bloodiest single day of the Civil War, was important because it
Agave Lincoln the victory he needed to issue the Emancipation Proclamation
Bended the Civil War
Cbegan Reconstruction
Dforced France to join the Confederacy
Explanation
The Union’s narrow success at Antietam let Lincoln announce the Emancipation Proclamation, reframing the war’s purpose.