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The opening of the Panama Canal in 1914 influenced the economic geography of the United States. The opening of the canal was one of the largest changes to international shipping distances, leading to big changes in market access for every US county, with big variations in the degree of this change across the US. The opening took place at a time when international trade overwhelmingly took place by ship, which makes this change in distances a more precise measure of trade than it would be in later decades.
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