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What areas did the Lewis and Clark expedition and the Pike expedition explore? Lewis and Clark explored the Northern part of the Louisiana Purchase, traveling up the Missouri River, and Pike explored the southern half, looking for the start of the Red River. Why were Meriwether Lewis and William Clark chosen to lead the exploration of the Louisiana Purchase? Lewis was chosen because of his experience as a leader, and Clark was chosen for his mapmaking skills.
The members of the Corps of Discovery were soldiers, but their purpose was peaceful -- exploration, diplomacy, and science. Lewis was commissioned as a Captain of the Army of the United States, Clark as a Lieutenant (although this inferior rank was kept secret from the men, and Clark was always called Captain).lanning the Expedition. In 1803, when was President of the United States, the U.S. purchased the Louisiana Territory from France. This was a huge tract of over 800,000 square miles, taking in nearly the entire mid-section of North America from present-day Texas and Louisiana up to Montana and North Dakota.