What type of crop fields depend on migrant farmworkers?

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a list of some are: raspberries, strawberries, blueberries, apples, cherries, potatoes, or anything that needs to be picked by hand, or sorted by hand

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What type of crop did they use in america in the 19 centurey?  Migrant farmworkers who left the dust bowl during the grat depression to seek work elsewhere?