What was the main mission of the expedition?
To log all animals and plants found
To find a water route to the Pacific
To find gold and conquer native people

To find a water route to the pacific

Explanation:

Lewis and Clark had to find a water route to the Pacific, and while they reached the Pacific no water route was discovered because there isnt one.

c]extended voting rights to african americans

the exclusive possession or control of the supply or trade in a commodity or service.