Meriwether lewis and william clark open the american frontier to settlement by displacing several american indian groups. expanding american knowledge of the continent. negotiating an important treaty with france. discovering a river route to the pacific ocean.

Meriwether Lewis and William Clark helped open the American frontier to settlement by exploring the regions further out west. They mapped these territories and found accessible routes, so that Americans could move further out west and settle the land before the Europeans could claim it. There was also a smaller objective of studying the science and possible economic qualities.

Their solution was to tax the colonists.