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sharkgirl sharkgirl
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6 years ago
The United States changed to standard time zones when
 
  a. Congress passed a law establishing this system.
  b. the railroads needed to develop coordinated schedules across the continent.
  c. factories demanded standard time schedules.
  d. long-distance telephones required standard time coordination.
  e. farmers needed to know train schedules to deliver crops to market.
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