What were contributing factors that led to World War 2 choose 7?

Germany didn't make payments on time.
Unresolved tensions.
Anger
The league of nations worked well
WW1 aided the rise of Hitler and the Nazi party
Russia underestimated Germany
The Great depression
Germany chose a Democrat leader
Racism
Germany rearming the nation
Italy's disagreement with Russia
Annexing Switzerland
Annexing part of Czechoslovakia
Invading Poland
Japan wanted territories in Europe
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