Basically, the reason of the 1929 wall street stock crash was economic imbalances and structural failings, which caused the companies were not able to pay off their Debts. The crashes directly resulted in the Great Depression , in which the people in United States really hard to find a job.
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December 11 1936 until his death
You didn't include the map, so I can't be entirely sure, but if it's the same test that I have, it's B.
The creation of the League of Nations
Nirvana, escape from this plane of existance
