(A) It made the war about defending the Constitution
(B) It made the war about preserving the union of the country
(C) ** It made the war about ending slavery
(D) It made the war about keeping slavery
EXPLANATIONS BELOW
Concept note-1: -The Emancipation Proclamation confirmed their insistence that the war for the Union must become a war for freedom. It added moral force to the Union cause and strengthened the Union both militarily and politically.