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Most railroads ran east-west to enable ______________ to move quickly across the plains and mountains.

User MFARID
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Answer:

I believe D all of the above.

Step-by-step explanation:

User Arunendra
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People. Goods were also moved quickly across the east and the west.  Never before had any form of transportation allowed people to get from the easy to the west in a quick amount of time. Before the railroads the United States was not unified because its economy, people, and communications spread so slowly or not at all. 
User Ctford
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