Final answer:
The Emancipation Proclamation strengthened abolitionist support for the Civil War during a critical period by declaring slaves in rebellious states free, altering the war's focus.
Explanation:
The Emancipation Proclamation bolstered abolitionist support for the Civil War at a time when Northern support was lagging due to Union losses. The proclamation, issued by President Abraham Lincoln in 1863, declared all slaves in rebellious states to be free, shifting the focus of the war towards ending slavery.
One key reason for the Emancipation Proclamation was to deprive the South of its labor force and weaken its ability to fight. Additionally, it aimed to enlist African Americans as soldiers for the Union army and undermine British support for the Confederacy due to its anti-slavery sentiments.
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