Answer: It bolstered the US claim to the states of Oregon and Washington that exist today.
Explanation: The Crucial Role of the Expedition The Lewis and Clark Expedition had several accomplishments.
As a result, the imperial struggle for control of North America, particularly in the Pacific Northwest, was changed.
It bolstered the US claim to the states of Oregon and Washington that exist today. It bolstered the US claim to the states of Oregon and Washington that exist today.