Final answer:
Lewis and Clark's expedition achieved many of Jefferson's goals, such as establishing trade with Native American tribes and mapping and claiming the territory.
Step-by-step explanation:
Thomas Jefferson sent Lewis and Clark on an expedition to achieve several goals. He wanted them to find an all-water route to the Pacific Ocean, strengthen U.S. claims to the Pacific Northwest through an overland route, explore and map the territory, study its natural resources and wildlife, and establish trade with Native American tribes. While they did not find the Northwest Passage, Lewis and Clark collected valuable information on Indian tribes, geography, and the flora and fauna of the areas they explored. They also built relationships with Native Americans, paved the way for fur trade in Oregon, and accurately mapped and claimed the territory for the United States.