Where did the fredericksberg war happened?
George McClellan...replaced by... John Pope...after Second Manassas, replaced by.. George McClellan...after Antietam, replaced by... Ambrose Burnside..after Fredericksberg, replaced by... Joe Hooker..after Chancellorsville, replaced by... George Meade...Meade held the title through the war but Grant was really in charge during the Overland Campaign.
If world war one had not happened then I don't think that world war two would have happened. Sometimes you have to ask yourself: What did it achieve? If you can't come up with an good answer then there was almost no point in the world war one. If world war one had not happened then there would probably not have been a world war two!