Well if we're really going to be technical, WW2 started the moment Germany lost WW1 and The Treaty of Versailles was signed, which didn't leave anyone really happy, it basically just guaranteed bad blood would linger, even among allies.
But yea, that's just semantics. WW2 Started September, 1939, with the German invasion of Poland, which was what really put the "world" into world war 2.
EDIT: I really have this bad habit of opening a thread in a tab, forgetting about it, then coming back 20 minutes later without refreshing to see what everyone else has posted. Really ought to cut down on how often I'm ninja'd.
But yea, that's just semantics. WW2 Started September, 1939, with the German invasion of Poland, which was what really put the "world" into world war 2.
EDIT: I really have this bad habit of opening a thread in a tab, forgetting about it, then coming back 20 minutes later without refreshing to see what everyone else has posted. Really ought to cut down on how often I'm ninja'd.