Wildly enough, may look back at the Cold War with fondness as it represented a time when the US knew who its enemies were. This is contrast to the state of warfare today where the US is fighting terrorist groups around the world.
The Answer Is: D) an electronic linking...
D.), because that allowed factory workers to work night shifts as well. It's not A.), because that happened during the first Industrial Revolution came about and trains became widespread. B.) doesn't make sense, because you really can only harvest in the daylight, and there's nowhere to put a light bulb. C.) is more of an effect of D.)
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