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![Map of Lewis and Clark's Track across North America](http://up.wiki.x.io/wikipedia/commons/thumb/6/6c/Map_of_Lewis_and_Clark%27s_Track%2C_Across_the_Western_Portion_of_North_America%2C_published_1814.jpg/500px-Map_of_Lewis_and_Clark%27s_Track%2C_Across_the_Western_Portion_of_North_America%2C_published_1814.jpg)
The Lewis and Clark Expedition (1804–1806) was the first United States overland expedition to the Pacific coast and back, led by Captain Meriwether Lewis and William Clark|Second Lieutenant William Clark, of the US Army.