Answer:
The Emancipation Proclamation is essential to helping the Union win the war
Step-by-step 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.