What impact did the Lewis and Clark expedition have on developing the United States west of the Mississippi River? Thanks!

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The Lewis and Clark expedition was of critical importance in the development of the area west of the Mississippi River. Their journals provided the first continuous record of routes that could be used to cross the great expanse of land between the Mississippi and the Pacific Ocean, including records of Indian tribes encountered along the way, rivers and the challenges involved in navigating them, mountain ranges and the difficulties crossing them, and the richness of the land. Samples of plants and animals were recorded and collected, contacts with tribes were established, and the appetite for new adventure that shaped so much of American history was whetted.

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