Answer: Sacagawea was a key member of the Lewis and Clark Expedition, serving as a translator and guide. Her knowledge of the Native American cultures and language, as well as her influence with the Shoshone tribe, helped the Expedition make successful contact with Native American nations, as well as negotiate for horses and supplies. Additionally, Sacagawea was the only female member of the Expedition, adding a unique perspective to the team.
The Missouri River was a key component of the Lewis and Clark Expedition, providing a route from the Midwest to the Pacific Ocean. The river enabled the Expedition to traverse the Great Plains and explore the West, as well as providing access to Native American tribes and trade routes. The Missouri River also served as a way for the Expedition to transport supplies and equipment, as well as to establish communication with the United States government.