Weegy: Sacagawea was a Lemhi Shoshone woman who helped the Lewis and Clark Expedition in achieving their chartered mission objectives by exploring the Louisiana Territory.
User: How did they reach the Pacific Ocean?
Weegy: Lewis and Clark reached the Pacific Ocean by boat up the Missouri River to its headwaters, then via the Columbia River.
User: When did they return to St Louis?
Weegy: Lewis and Clark returned to St. Louis on September 23, 1806.
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