Question

Why did the banks closed down after the crash​

Answer 1

As the economic depression deepened in the early 30s, and as farmers had less and less money to spend in town, banks began to fail at alarming rates. ... After the crash during the first 10 months of 1930, 744 banks failed – 10 times as many. In all, 9,000 banks failed during the decade of the 30s.

( Note : this was taken from a source )

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Answer 2

Answer: They had invested depositer's money in the stock market and made loans to stock speculators to invest

Explanation: Hope this helps :)