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In order to make their schedules more standard, what did the railroads do?

A. Forced every train to leave its station on the hour
OB. Allowed each train to set its own schedule
OC. Divided the United States into time zones
D. Put the whole United States on the same time

User Jpsasi
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1 Answer

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C. Divided the United States into time zones.
User Ebosi
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