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The first ever transcontinental railroad was completed a century and a half ago. On May 10th 1869 it was driven into the ground and put to use.
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At the laboratory in Menlo Park, New Jersey Edison managed to get the first all electric light bulb. This is useful to us because without the light bulb we would have fire torches and it would be harder to see and manage without it. Electricity was passed through platinum filament in the glass vacuum bulb.
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This was really important because it extended the US territory into the Pacific
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