The Dust Bowl occurred in the part of the United States.
Based on the film you have just seen, you can infer that the majority of those affected moved around to find jobs .
According to the song, the “land of promise” could be found in .

central, on farms, the pacific northwest

Explanation:

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the main inference that can be drawn from jean jacques rousseau's book the social contract is: a. people can enjoy civil and physical freedom, even if it sometimes harms society.