Why did they do the Lewis and Clark expedition?

Question:To explore the United States' recent land purchase of the Louisiana Territory and more importantly find the Northwest passage which was hoped could be used to link the Atlantic and Pacific coasts of North America.

Best Answer - Chosen by Asker: To explore the United States' recent land purchase of the Louisiana Territory and more importantly find the Northwest passage which was hoped could be used to link the Atlantic and Pacific coasts of North America.

Because Alexander McKenzie had crossed the North American continent ten years earlier and Lewis and Clark wanted to know if there was an easier route or a quicker route than the one taken by the Canadians.