Answer:
From the first days of the Civil War, slaves had acted to secure their own liberty. The Emancipation Proclamation confirmed their insistence that the war for the Union must become a war for freedom.
Step-by-step explanation:
President Lincoln justified the Emancipation Proclamation as a war measure intended to cripple the Confederacy. Being careful to respect the limits of his authority, Lincoln applied the Emancipation Proclamation only to the Southern states in rebellion.