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Definately climate science. Given that soil disparity was driving farmers off their land. The dust bowl didn't help either, but I don't know if that was before or after GOW.
And as stated before, there's quite a bit of medical science. Again, the stresses of the journey causing a rather young woman's pregnancy to end in a stillbirth, for instance. Lack of food, lack of sleep, lack of sanitation, high stress, her age (18 ), all the dust she would have been breathing in...there's quite a lot to factor in with that alone.
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