The Battle of Antietam (Sharpsburg) had what important political consequence in addition to its military significance?

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The Battle of Antietam was the first major victory for the Union Army during the Civil War and it enabled President Lincoln to issue the preliminary Emancipation Proclamation, which declared that all slaves in Confederate-held territory would be set free on January 1, 1863. This had important political consequences as it transformed the Union's war effort into a fight against slavery, and helped to shift public opinion in favor of the Union cause. It also prevented European nations from recognizing the Confederacy, as they were hesitant to support a country whose economy was built on slavery.

The Battle of Antietam (Sharpsburg) Had What Important Political Consequence