President lincoln issued the emancipation proclamation after
a) the union’s effectiveness at the battle of antietam.
b) the death of general jackson at chancellorsville.
c) the nation had voted to decide the issue of slavery.
d) the capture of washington, dc, by confederate forces.

The correct answer is: A) the Union's effectiveness at the Batlle of Antietam.

The Emancipation Proclamation was issued on January 1, 1863 by Abraham Lincoln; in it he declared that the people held as slaves within the rebel states or the Confederate States, "are, and henceforward shall be free." Another topic adressed the black military units to establish among the Union Forces. The opportunity to issue the Proclamation came after the Union won at the Battle of Antietam held on September 17, 1862.

c or d both can be the answer