Answer:
Answer: D. Louisiana was already purchased.
(Pls mark brainiest if this helped! :D)
President Thomas Jefferson commissioned the expedition after the Louisiana Purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an American presence in this territory before Britain and other European powers tried to claim it. Also the objectives were scientific and economic: to study the area's plants, animal life, and geography, and to establish trade with local American Indian tribes.
Explanation:
