The causes of World War Two were principally derived from three things - all of which are common mistakes:
1) The first was claiming 'a peace dividend' as if no other wars could possibly ever happen. The damage caused by this policy across Western nations cannot be overstated.
2) Accepting all of Hitler's abuses of the Treaty. He armed, he began an airforce and he took over disputed lands which had been taken away from Germany.
3) That acceptance of rearmament and allowing Hitler's 'salami slicing' tactics of lands claimed had to be challenged - and it was not. This was cowardice of the worst type - and what a price had to be paid for it.
Military force, employed at the very start of Hitler's machinations would inevitably have stopped Adolph in his tracks. WW2 would not have happened - in Europe, at least.
Extreme weakness was displayed by war-weary nations who were also afraid because they doubted that their weaponry was good enough any longer. It wasn't - Hitler had been permitted a head start.
The pathetic League of Nations was simply ignored by Hitler as it showed no teeth.
