Ray, I'd argue the First and Second World war were continuations of the Franco Prussian war. 1870 to 1871, that started Prusssia off on expansion. Bismark then said to the rest of the Germanic states, 'Let's form a nation, and before you say you and whose army, look out the window'. End result the German Empire, with immidiate plans of expansion, France- The previous 'Bad man of Europe', humiliated and resentful. Britian feeling threatned, and away we go!
Following the Great War, Germany was destitue and humiliated. Also take into acount the influence of The German Army in polotics. The majority of the male population had been in the fighting. The concept was growing that the German Army had not been defeated! It was those wishy washy DEMOCRATIC POLOTICIANS had sold out the fighting man! The military and aristocracy then needed a stalking horse, and obliginly up popped this hair brained little failed artist, Called Adolf Hitler, just what was required! Any time he got too above himself the army could knock him down. However Hitler wasn't that stupid, as soon as he was able he used his political position to put the Army down, and the rest is history.