Prioritized regional interests is the excerpt most directly expresses an economic perspective. Since the south already had rivers to carry products and they did not want to invest on roads and canals that would not help American.
The application of the principles of optimizing behavior, demand, and supply to institutions and conduct in the political sphere is referred to as "economics from a political perspective."
Conservative economists, Progressive economists and Radical economists are the three discipline of economics.
Thus, Prioritized regional interests is the excerpt that express economic perspective.
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