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Meriwether Lewis was tasked with exploring land west of the Mississippi by Tomas Jefferson. He chose William Clark to be his co-leader.
https://toriavey.com/history-kitchen/what-lewis-and-clark-ate/ -
Dies of abdominal infection, possible appendicitis. He was the only member of the corps to die on the journey.
https://en.wikipedia.org/wiki/Charles_Floyd_(explorer) -
Completed mission. Made camp near present day Astoria, Oregon and started building Fort Clatsop.
http://www.lewis-clark.org/article/655 -
Sent some of their crew and their keelboat loaded with zoological and botanical samplings, maps, reports, and letters back to St. Louis.
http://www.lewis-clark.org/article/496 -
Share their experiences with President Jefferson.
https://en.wikipedia.org/wiki/Thomas_Jefferson