Explain how the outcome of World War I helped cause World War II. *

The First World War ended in a complete victory and an unstable peace. Post-war Germany, disarmed and humiliated, became a weak and short-lived republic. ... The war left the principal powers divided from one another, even at the Versailles treaty negotiations – vengeful toward old enemies and distrustful of old friends.

"the attempts of the proletariat to rise above this abasement"