A. They lost some jobs because of mechanization
B. They were unable to produce sufficient food for urban areas
C. They raised their productivity by using new machinery
D. They sold food to European countries
Đáp án là B
A được đề cập: The labor that ran the factories and built the railways was recruited in part from American farm areas where people were being displaced by farm machinery
C được đề cập: The increased urban population was nourished by the increased farm production that, in turn, was made more productive by the use of the new farm machinery.
D được đề cập: American agricultural production kept up with the urban demand and still had surpluses for sale to the industrial centers of Europe.
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