Which of the following was probably the most difficult challenge facing construction of the railroad?

asked Dec 14, 2020 25.4k views

4 votes

by Ambie

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3 votes

What is the following?

Messa answered Dec 15, 2020

by Messa

5.8k points

0 votes

Answer:

getting over the rocky mountains

Step-by-step explanation:

Tim Bird answered Dec 21, 2020

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