What clues do you need? She was hit by a German torpedo, she exploded and sunk.
The German's claimed she sunk so quickly because she was carrying munitions. I think i've seen a video claiming that the explosion caused coal dust stored against the hole to ignite, and that is what blew her hull open.
Are we going to take back our involvement in World War I, if we find out she was actually carrying munitions?
Well, first of all, despite what this article says, this did not get us into WWI. We didn't enter the war until 1917, and after the 1916 presidential election.
Secondly, if we could take back our involvement in World War I, we absolutely should do it. It was the worst decision in U.S. history and all the problems we complain about on this site today trace back to it.