What part of north america was explored by lewis and clark

Caption: The following pictures are actually a challenge coin. Challenge coins were used as a sort of slap on the table and you gotta buy the drinks type thing, mainly used to challenge; "wow look at that." Anyway, this is particular due to the history of the code breakers who broke codes for the Japanese. Which aided in major naval and island victories, who aided America's attempt of island hopping to get closer to the Japan homeland.

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