Well, Germany probably never would have held to all that territory. It wasn't exactly the starter of that conflict, one of its allies was
Hitler wanted all of the territory because of his idealogoy of the mother country of Austria-Germany in his book, Mein Kampf. He went into detail about doing all of this in prison, got out, tried to start a revolution, failed, and started major propaganda.

Without Hitler, the Nazi movement wouldnt have gotten into power