At the end of the Civil War, what communications system did the railroads use to coordinate their ...

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At the end of the Civil War, what communications system did the railroads use to coordinate their ...

At the end of the Civil War, what communications system did the railroads use to coordinate their complex flow of rail cars?

A) The telephone
B) The Pony Express
C) The magnetic telegraph
D) The internet
E) Text-messaging

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