Accomplishments during this expedition were, establishing trade with native Americans, expanding and exploring into the west, and mapping out a huge part of America.
Lewis and Clark went through a lot on their journey expanding to new territory that no american has been stepped on. Some hardships and dilemmas that they faced on their journey were, traveling miles and miles every single day without a map without knowing what they were gonna face and where they were headed too, wildlife was a big deal all the different species of animals, and diseases that went around during their journey, Also the extreme weather impacted the expedition a lot and delayed the time.
During their expedition they came across new species, plants, and environment. Some of the animals they came across were Elk, Beaver, Black bear, Golden eagle. Plants that were found were Bearberry, Dwarf Sagebrush, and Pin cherry.