Many Americans hoped that the Oregon Country would provide them with O a base from which to invade Canada.

a direct route to the Pacific Ocean.

direct access to the Gulf of Mexico.

control of commerce on the Mississippi River

Please Hel

a direct route to the Pacific Ocean.

Explanation:

The British were the first people to establish a stronghold in the Oregon Country and also engage in the extensive fur trade in the region. So, when the Americans settled in the Eastern area near the Mississippi, their main aim was to have a pacific coast border.

When Thomas Jefferson ordered Lewis and Clark to engage in the expedition, the aim was to find a route through the pacific ocean. Also, given that Amerca did not have a harbor, they longed to acquire the Puget Sound to serve as deep-harbor water for their ships.