Final answer:
Southerners believed the Civil War would be short due to advantageous defensive strategies, soldier skills, and underestimating the North.
Explanation:
Southerners thought the Civil War would be short primarily due to their unique advantages:
- They believed defending their territory and waiting out the North would lead to victory.
- Confederate soldiers' familiarity with firearms and horse riding gave them an edge.
- Leaders thought the North would not use full military force, underestimating their determination.
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