In the 1920s, many rural backs failed because

In the 1920s, many rural banks failed because farmers could not repay their loans. ... In the 1920s, many rural banks failed because of the failure of the farms to produce the bumper crops they were producing previously. The farmers had invested too much money in machinery as well as storage facilities.

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farmers could not repay their loans

Explanation:

the answer is migration

austria

hugary

yugoslavia

czechoslovakia