The emancipation proclamation announced

a) an end to slavery in the confederacy
b) the union victory at antietam
c) an end to the civil war
d) the activities of harriet tubman

The answer is A) an end to slavery in the confederacy.

answer; /// i believe that the correct answer is (d)the huang he river valley;

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".