Final answer:
The Lewis and Clark expedition mapped out the uncharted western territories, documented its natural resources, and established relations with Native American tribes, thereby solidifying U.S. claims to the land.
Step-by-step explanation:
Impact of the Lewis and Clark Expedition
The Lewis and Clark expedition significantly enhanced American knowledge of western territories. The corps, led by Meriwether Lewis and William Clark, ventured from the Missouri River to the Pacific Coast between 1804 and 1806. Despite failing to find a Northwest Passage, their journey yielded extensive information about the region's geography, fauna, flora, and Native American tribes.
Through comprehensive mapping and documentation, they provided America with a clearer understanding of the vast territories. They established peaceful relationships with multiple Native American tribes, crucial for the subsequent fur trade and U.S. territorial claims.
More than collecting hundreds of plant and animal specimens, including new discoveries named after themselves, Lewis and Clark's notes and maps paved the way for future exploration, trade, and American expansion into the new frontier. Through their efforts, they contributed to solidifying the United States' claim over the immense territory west of the Mississippi River.
Lastly, their expedition solidified U.S. claims to the land, allowing the United States to assert its authority over the vast western territories.