The text covers only Lewis' expedition to locate the northern headwaters of the Marias River; the book does not cover in detail the exploration conducted by any of the other groups, though their experiences are mentioned in passing. This chapter thus deals only with Meriwether Lewis and the few men that accompany him. In early July they set off to discover whether the headwaters of the Marias River—and thus of the Missouri River drainage basin—extend beyond 49 degrees north latitude. If they do, then the United States of America can lay legal claim to more territory due to the terms of the Louisiana Purchase. The small group proceeds down the Big Blackfoot River as far as White Bear Island without major incident......
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