A major change that resulted from he completion of the transcontinental railroad is that goods could be shipped east to west much faster.
The Transcontinental Railroad allowed cargo to be shipped east and west as fast as possible because the railway almost had a "direct" route to its destination.
The Transcontinental Railroad allowed commodities to reach their destinations at greater speeds unlike the usual mode of travel at that time, which often traveled by car or by transit on many different trains.
Thus, A major change that resulted from the completion of the transcontinental railroad is that goods could be shipped east to west much faster.
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