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5-6 5-Today President Jefferson convinced congress to fund a small western expedition. To lead the expedition Jefferson chose former army captain Meriwether Lewis. Lewis decided William Clark would be the best co leader of the expedition. Jefferson wants them to explore the Missouri river and to establish friendships with the Indian tribes. Jefferson also wants them to study animals, vegetation, soil, and climate. They are set to leave in May. 6- Lewis and Clark are traveling up the Missouri river encountering many Indian tribes along there way. Every encounter of a tribe brings new information to Lewis and clark. Most of the help came from an Indian named Sacagawea. She led them across the country and Described the land. She would tell them about vegetation and the climate. Lewis and Clark kept journals describing there trip. They wrote about the tribes they met and the land they had discovered. They also described the dangers such as steep mountains, sickness, and terrible storms.