What was the mighty River that Lewis and Clark expedition and the native America

Question: What was the mighty River that Lewis and Clark expedition and the native Americans they encountered!.!?

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They were commissioned to chart the Missouri, and they met dozens of tribal groups of Natives!.Www@QuestionHome@Com

There were a few!.!.!.!. namely, the snake and the columbia, the clearwater river, and the willamette (sp!?)!.

The largest of those, is the Columbia River!.Www@QuestionHome@Com