Answer:
President Abraham Lincoln issued the Emancipation Proclamation.
On January 1, 1863.
The proclamation reason was that all persons held as slaves within the rebellious states are henceforward shall be free.
Jefferson Davis called Lincoln's action “the most execrable measure recorded in the history of guilty man.” And Other Confederates reacted with greater defiance
It proclaimed the freedom of slaves in the ten Confederate states still in rebellion. It also decreed that freed slaves could be enlisted in the Union Army, thereby increasing the Union's available manpower.
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