Based on what you have learned, why would victories in the western theater have been important to the Union?

D union morale was low after its many losses, and victories would raise that morale.

Explanation:

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In the Civil War, the Confederate Army was very interested in targeting the Southwest as a potential ally and area of expansion due to overlapping cultural and economic interests.

As a result, it was important for the Union to be seen as winning in the West to keep the settlers of the Southwest from allying too much with the Confederate army.