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Pioneers who crossed the western mountains in the mid-1800s were threatened by

User Yajushi
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Answer:

weather is the reason the had to move

Step-by-step explanation:

User Benoit
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They faced certain death if they did didn't before the early snow falls. The mountain passes were too treacherous for wagon trains when they were iced over. Availability of food would have also been a problem.
User Federico Vera
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