The correct response regarding an effect of Lincoln’s issuing of the Emancipation Proclamation is: It won the sympathy of Europeans, making it less likely for them to support the Confederacy.
The Emancipation Proclamation, issued on January 1, 1863, declared the freedom of all slaves in Confederate-held territory, which shifted the focus of the Civil War to include the moral cause of ending slavery. This action helped garner sympathy for the Union cause from European nations, particularly Great Britain and France, which were less inclined to support the Confederacy due to its defense of slavery.
The other options have inaccuracies or implications that do not fully align with the historical context of the Proclamation:
- Slaves in the border states were not freed by the Proclamation.
- While some abolitionists were critical, there were also many who supported the Proclamation as a step towards ending slavery.
- Morale in the South may have been affected in various ways, but the Proclamation primarily aimed to weaken the Confederacy's labor force.