The outbreak of new wars led to the decreased manpower in the western forts of the United States of America. Option C is the correct answer.
- During the Civil War, a western fort, Fort Smith in Arkansas, in the border of the State of Oklahoma, was captured by the Unionists from the Confederates.
- This was possible because the manpower at these forts were low, or had relatively decreased.
- The reasons for this, was because new wars were being fought all over the Southern States, including Oklahoma.
From the above it is clear that, the outbreak of new wars resulted in the lessened manpower in the western forts.
Learn more about the Effects of Civil War on Southern States here:
https://brainly.com/question/15784261
#SPJ10
