To add to this, the proclamation was made in 1863 instead of 1861 at
the beggining of the war. If it had been over the moral issue, the
proclamation would have been mad at the start of the war, but since
Lincolns main goal was to preserve the union he only made it once he
was no longer afraid of losing any more border states, and once it
would have the desired political and military efect. It was therefore
not a moral issue, but a political and military one