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The Lewis and Clark Expedition (1804-1806), headed by Meriwether Lewis and William Clark , was the first American overland expedition to the Pacific Coast and back.


EARLIER EUROPEAN EXPLORATION TO THE PACIFIC COAST

While the Lewis and Clark Expedition was the first American overland expedition to the Pacific coast, it was preceded over a decade earlier by a Canadian expedition led by explorer Sir Alexander Mackenzie , whose expedition completed the first recorded transcontinental crossing of North America north of Mexico by a person not of the Indigenous Peoples Of The Americas , in July 1793 .


LOUISIANA PURCHASE AND A WESTERN EXPEDITION