What are the causes and features of the Great Depression in the United States?

Causes of the Great Depression in the United States:
Significant excess of supply over demand
There were technologies of mass production, but there was no one to buy goods
A large number of unemployed

Features:
The crisis covered all spheres of society (i.e. spiritual, economic, political and social)
The crisis was of a global nature (except for the USSR)
It was the longest crisis in history
Production fell by more than 50%



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