Lewis and Clark were partners in this investigation. York was Clark´s slave and Sacajawea was their translator when they had to the indigenous.
Answer:
Lewis, Clark, Sacajawea and York were the most important members of the Lewis and Clark Expedition.
Explanation:
The Lewis and Clark Expedition was sent by President Thomas Jefferson in 1804 under the leadership of Meriwether Lewis and William Clark through the newly acquired Louisiana Territory. It was the first cross-country voyage through the western United States of America that led to the coast of the Pacific Ocean at the mouth of the Columbia River in today's Washington state. The expedition took two years to complete and laid the foundation for US expansion to the west. A lot of knowledge was gathered about the still unexplored areas in the heart of the North American continent.
