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1 vote
Which describes a major challenge facing the builders of the transcontinental railroad?

A. bridging the Rio Grande River

B. spanning the Grand Canyon

C. tunneling under Lake Erie

D. crossing the Sierra Nevada mountains

User Dennis Huo
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2 Answers

4 votes

Answer: the answer is A bridging the rio grande river

Explanation: wherefore the answer is A

User Powderham
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5 votes
Crossing the Sierra Nevada Mountains would be your answer. Answer: D.
User Saggio
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