Answer:
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.
Step-by-step explanation:
President Abraham Lincoln issued the Emancipation Proclamation on January 1, 1863, announcing, "that all persons held as slaves" within the rebellious areas "are, and henceforward shall be free."
Although the Emancipation Proclamation did not end slavery in the nation, it did fundamentally transform the character of the war. After January 1, 1863, every advance of federal troops expanded the domain of freedom. Moreover, the Proclamation announced the acceptance of Black men into the Union Army and Navy, enabling the liberated to become liberators. By the end of the war, almost 200,000 Black soldiers and sailors had fought for the Union and freedom.