Was the Battle of Antietam a Union victory, defeat, or was it a stalemate ? Give reasons for your answer.

3 answers

What do you think?

http://www.nps.gov/hps/abpp/battles/md003.htm

http://en.wikipedia.org/wiki/Battle_of_Antietam#Aftermath
I've seen all three answeres...which is correct? need your help
This question doesn't have a "correct" answer. Your teacher wants your opinion. Support it with facts.