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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.
Meriwether Lewis Describes Crossing the Rocky Mountains. These selections from Meriwether Lewis' journal describe the crossing of the Rocky Mountains, a particularly hazardous stretch of the Lewis and Clark Expedition.In 1804 President Thomas Jefferson commissioned Lewis and William Clark to explore the vast territory of the Louisiana Purchase, recently acquired from France.oth Lewis and Clark, along with several other members of the Corps of Discovery, recorded their impressions of the expedition's often-perilous journey in carefully detailed journal entries.