20. The author is primarily concerned with
showing that a certain interpretation is better supported by the evidence than is an alternative explanation
developing an alternative interpretation by using sources of evidence that formerly had been unavailable
questioning the accuracy of the evidence that most scholars have used to counter the authors own interpretation
reviewing the evidence that formerly had been thought to obscure a valid interpretation
presenting evidence in support of a controversial version of an earlier interpretation
21. According to the author, changes in the conditions of international trade resulted in an
underestimation of the amount of new land that was being famed in the United States
underutilization of relatively small but rich plots of land
overexpansion of the world transportation network for shipping agricultural products
extension of agrarian depressions beyond national boundaries
emphasis on the importance of market forces in determining the prices of agricultural products
22. The author implies that the change in the state of the American farmers morale during the latter part of the nineteenth century was traceable to the American farmers increasing perception that the
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