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Explore the profound relationship between the United States' territorial expansion and the evolution of its Constitution. This historical process fundamentally shaped American governance, identity, and legal framework, adapting to new lands and diverse populations.

The Corps of Discovery, famously led by Meriwether Lewis and William Clark, was a monumental American expedition from 1804 to 1806. Its primary goal was to explore the newly acquired Louisiana Purchase, seeking a practical route to the Pacific Ocean (the mythical Northwest Passage) and gathering crucial scientific and geographical data, significantly contributing to westward expansion.