... water route west, Jefferson had other important objectives for this expedition, which he discussed in detail in a long memo to Lewis. The memo included the following: • Plot the Missouri River's tributaries, islands, and rapids using various instruments • Tell the Indian nations about the U.S.'s wish of peace; note their names, populations, and culture • Gather plant and animal specimens, keep weather records, take ... he helped the explorers. It wasn't a promise that Lewis could keep, but it nevertheless worked. On September 1, the Corps set off north along the Continental Divide, ...

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• Grade Level: High School