How did the emancipation proclamation change the meaning of the civil war? -by freeing southern troops from their military commitments so they could return home -by eliminating slavery in new states and territories -by securing voting rights for black property holders in both the north and south -by promising an end to slavery in the confederate states my guess is b

D. By promising an end to slavery in the confederate states

Explanation:

The Emancipation Proclamation changed the course of the civil war, from protecting the Union to redefining what they meant by freedom.  Also, this meant an incentive that slaves in areas not occupied by the Union would be set free, but slaves in Union territory would remain enslaved.

Reference: Thompson, Kathleen. “The Meaning of the Emancipation Proclamation.” Civil Discourse, Civil Discourse, 18 Apr. 2018

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explanation:

b. sec, foreign relations