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Inline Dropdown Question
Select the correct word or words to make the sentence true.
The Query
were a major physical barrier to the westward expansion of the United States in the 1800s.
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Answered by
GPT-5 mini
AI
The Rocky Mountains were a major physical barrier to the westward expansion of the United States in the 1800s.
(Their high peaks and rugged terrain made travel and transportation difficult until passes, railroads, and improved routes were developed.)
(Their high peaks and rugged terrain made travel and transportation difficult until passes, railroads, and improved routes were developed.)
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