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题目材料：
Many scholars view the 1892 arrival of the boll weevil, a destructive agricultural pest, as a drastic shock to the economic routine of the cotton-dependent American South, and as one trigger of the Great Migration of African Americans to the North in search of employment opportunities. However, Higgs argues that such accounts exaggerate the insect`s impact on the southern cotton industry specifically and on the southern economy as a whole. His fundamental point is that the reductions in supply caused by the weevil led to offsetting increases in prices paid to cotton farmers. In Higgs`s view the boll weevil infestation was neither a necessary nor a sufficient condition underlying the Great Migration. And as Giesen observed, the South produced more cotton in 1921 than in 1892.
以上解析由 考满分老师提供。
