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The use of the Blunderbuss by Lewis and Clark was mainly for them to impress American Indians with their power.
Lewis and Clark did not go unarmed into their expedition and it was understood that they would have to hunt for food and might have to fight enemies for their defense.
As a result, they took weapons along like the blunderbuss, muskets, and rifles. The Blunderbuss ended up being used by Lewis and Clark to impress Native Indians with their power, and to get them to submit.
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