What is President Lincoln's claim in The Emancipation Proclamation?Immersive Reader The North and South should reunite peacefully The Emancipation Proclamation is essential to helping the Union win the war The North has a responsibility to protect newly freed slaves Southern states would be allowed to join congress if they surrendered

The Emancipation Proclamation is essential to helping the Union win the war

Explanation:

The Emancipation Proclamation was a call to the Southern States to surrender peacefully to the Union within a hundred days or have all their slaves declared free. Slaves who were declared free could join the Union's military force and gain their protection. Lincoln described this as a 'fit and necessary war measure'.

When this happened, the force would be strengthened and this would help the North in winning the war against the Southern confederacy.  

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op: object of preposition