Well seeing that the colonists were beaten so badly by the British at Bunker Hill, if they had surrendered, lives probably would've been saved
I believe the answer is: Evolutionary perspective
The evolutionary perspective view the pychological traits that human posessed as a result of continous process of adaptation that help humans to survive in our environment. According to this perspective The main function of the evolution of our psychology eventually is eventually to survive the natural selection and ensure our genes continues to the next generation.
The South thought that its secession from the Union would succeed because:
C. The South only had to defend itself against the North, not defeat it.