Which of the following events first led to westward exploration and expansion of the United States?

Question

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The Lewis and Clark expedition first led to westward exploration and expansion of the United States. The explorers set out from the Midwest to the Pacific Ocean to study the science and geography of the unexplored regions, as well as to discover ways to economically profit from its resources. Although the discovery of gold helped contribute to westward expansion, it wasn't discovered until 1848 in California.

Which of the Following Events First Led to Westward Exploration