The Dust Bowl migration was primarily caused by a combination of severe drought and poor agricultural practices that led to soil erosion in the Great Plains of the United States during the 1930s. The physical condition that describes this situation includes:
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Severe Drought: Extended periods of low rainfall significantly reduced soil moisture and the ability to grow crops.
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Soil Erosion: Intensive farming, particularly the plowing of native grasses that normally held the soil in place, led to loose, dry soil that could easily be blown away by strong winds.
Together, these conditions resulted in massive dust storms and agricultural collapse, causing many families to leave their farms in search of better living conditions elsewhere, particularly in California.