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The Rocky Mountains, it had no river running through it and they had to lead horses and carry their supplies for miles of slopes and descents.

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What was William clark's largest obstacle?

He did not have any maps of the areas he was heading into, and so the unexpected was his biggest obstacle.


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they brought back valueable scientific and geographic information


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Lewis and Clark crossed the Rocky Mountains to reach the Pacific Ocean. This formidable geographic barrier presented a significant challenge to their expedition, but they were able to navigate through it with the help of indigenous guides.


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Lewis & Clark began their expedition in 1804.


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