The feelings of North vs South are present in the reviews
Explanation:
Reviewer one largely condemned the South and it's views towards slavery while reviewer two came to the defense of the south, likely because they live there. The similarity in the reviews are the condemning of slavery as a whole.
Well, It wholly is based off the authors point of view. was he/she white or colored? Not only the author making it but what type of audience is the author trying to reach out to.
If I understand the question right, it would be showing bias in favor of the military, because of his location and the fact that he's talking about being supportive about the military.