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What led to the erosion of rail dominance in U.S. transportation?

Ejaylcuk

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What led to the erosion of rail dominance in U.S. transportation?

What led to the erosion of rail dominance in U.S. transportation?
a. Passenger air service in the 1920s
b. Government funded construction of roads
c. Steel price increase
d. Coal price increase

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apugs211

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Helped a lot

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