The emancipation proclamation affected the union’s civil war efforts by

allowing the union to turn its attention away from slavery.

increasing the number of troops who could join the union.

forcing southern slaveholders to free enslaved people.

forcing northern african americans to join the union army.

B on edge

Explanation:

The Emancipation Proclamation affected the Union’s Civil War efforts by increasing the number of troops who could join the Union.  Option B is correct.

The Emancipation Proclamation was issued by President Abraham Lincoln on January 1, 1863, as the nation approached its third year of bloody civil war. The proclamation declared "that all persons held as slaves" within the rebellious states "are, and henceforward shall be free."

i believe it was the shinto